259 lines
11 KiB
JSON
259 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-77207",
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"assignerOrgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
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"state": "PUBLISHED",
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"assignerShortName": "libreswan",
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"dateReserved": "2026-08-20T18:13:09.377Z",
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"datePublished": "2026-10-13T21:28:19.219Z",
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"dateUpdated": "2026-10-16T15:31:53.986Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
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"shortName": "libreswan",
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"dateUpdated": "2026-10-13T21:28:19.219Z"
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},
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"title": "Null Pointer Dereference in PKCS#7 bundle with no certificates",
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"descriptions": [
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{
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"lang": "en",
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"value": "Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication. When libreswan decodes an IKE CERT payload of type CERT_PKCS7_WRAPPED_X509, it guards the PKCS#7 blob with SEC_PKCS7ContainsCertsOrCrls() and then iterates the certificate list with SEC_PKCS7GetCertificateList(). The two NSS APIs disagree on a SignedData that carries a CRL but no certificates: ContainsCertsOrCrls() returns PR_TRUE (there is a CRL), so the guard passes, but GetCertificateList() returns NULL (there are no certificates). This causes libreswan to dereference a null pointer leading to a crash and restart. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. No remote code execution is possible. Continued exploitation can cause a denial of service."
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}
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],
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"affected": [
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{
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"vendor": "The Libreswan Project",
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"product": "libreswan",
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"packageName": "libreswan",
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"collectionURL": "https://github.com/libreswan/libreswan",
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"repo": "https://github.com/libreswan/libreswan",
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"versions": [
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{
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"version": "4.7",
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"status": "affected",
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"lessThanOrEqual": "5.3.2",
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"versionType": "semver"
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},
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{
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"version": "5.4",
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"status": "affected",
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"lessThanOrEqual": "5.4",
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"versionType": "semver"
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},
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{
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"version": "5.3.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.1",
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"status": "unaffected",
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"versionType": "semver"
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}
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],
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"defaultStatus": "unaffected",
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"programRoutines": [
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{
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"name": "decode_cert_payloads"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-476",
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"description": "CWE-476: Null Pointer Dereference"
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}
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]
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},
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-252",
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"description": "CWE-252: Unchecked Return Value"
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}
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]
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}
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],
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"impacts": [
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{
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"descriptions": [
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{
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"lang": "en",
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"value": "Denial of service via null pointer dereference in PKCS#7 certificate handling when processing malicious IKE_AUTH packets"
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}
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "HIGH"
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}
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},
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{
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"other": {
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"type": "vendorSeverity",
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"content": {
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"value": "MEDIUM",
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"description": "Vendor-assessed severity: Medium. Exploitation does not require authentication, but the daemon automatically restarts after the crash, requiring continued exploitation for sustained denial of service."
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}
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}
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}
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],
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"workarounds": [
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{
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"lang": "en",
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"value": "Apply the available patch or upgrade to a supported version. No configuration-based workaround is available."
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}
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],
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"solutions": [
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{
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"lang": "en",
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"value": "Upgrade to libreswan 5.3.3 or 5.4.1 or later. Patches are available at https://libreswan.org/security/CVE-2026-77207/"
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}
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],
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"exploits": [
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{
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"lang": "en",
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"value": "No known exploitation in the wild. Exploitation requires sending a malicious IKE CERT payload with a PKCS#7 SignedData containing a CRL but no certificates, and does not require peer authentication."
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}
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],
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"configurations": [
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{
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"lang": "en",
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"value": "Any server or client that accepts IKEv2 connections with certificate-based authentication is vulnerable."
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "tool",
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"value": "Claude (Anthropic)"
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},
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{
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"lang": "en",
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"type": "reporter",
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"value": "David Korczynski (ADA Logics Ltd)"
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}
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],
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"source": {
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"discovery": "EXTERNAL",
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"defects": [
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"CVE-2026-77207"
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]
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},
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"references": [
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{
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"name": "Libreswan Security Advisory CVE-2026-77207",
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"url": "https://libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txt",
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"tags": [
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"vendor-advisory"
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]
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},
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{
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"name": "Libreswan CVE-2026-77207 Patches",
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"url": "https://libreswan.org/security/CVE-2026-77207/",
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"tags": [
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"patch"
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]
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}
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],
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"timeline": [
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{
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"time": "2026-08-05T00:00:00.000Z",
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"lang": "en",
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"value": "Libreswan was notified of the issue via security@libreswan.org"
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},
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{
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"time": "2026-09-24T00:00:00.000Z",
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"lang": "en",
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"value": "Advanced notice given to supported customers and distributions"
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},
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{
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"time": "2026-10-05T00:00:00.000Z",
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"lang": "en",
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"value": "Public announcement and release of libreswan 5.3.3 and 5.4.1"
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}
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],
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"taxonomyMappings": [
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{
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"taxonomyName": "ATT&CK",
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"taxonomyVersion": "15.1",
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"taxonomyRelations": [
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{
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"taxonomyId": "T1499.004",
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"relationshipName": "maps to",
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"relationshipValue": "Application or System Exploitation (DoS)"
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}
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]
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}
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],
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-77207",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:14:50.209248Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T15:31:53.986Z"
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}
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}
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]
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}
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} |