218 lines
8.7 KiB
JSON
218 lines
8.7 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-2026-66033",
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"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"state": "PUBLISHED",
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"assignerShortName": "VulnCheck",
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"dateReserved": "2026-07-23T20:45:17.816Z",
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"datePublished": "2026-07-24T16:35:28.607Z",
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"dateUpdated": "2026-07-28T01:06:25.504Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"shortName": "VulnCheck",
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"dateUpdated": "2026-07-28T01:06:25.504Z"
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},
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"title": "libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation",
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"descriptions": [
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{
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"lang": "en",
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"value": "libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit the underflow in the expression computing blocksize minus aadlen minus authentication tag length to trigger an out-of-bounds read and a memcpy call with a near-SIZE_MAX length argument, causing immediate process crash before any authentication occurs."
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}
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],
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"tags": [
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"x_open-source"
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],
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"datePublic": "2026-07-23T00:00:00.000Z",
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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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"cweId": "CWE-191",
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"description": "Integer Underflow (Wrap or Wraparound)",
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"type": "CWE"
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},
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{
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"lang": "en",
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"cweId": "CWE-125",
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"description": "Out-of-bounds Read",
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"type": "CWE"
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}
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]
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}
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],
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"affected": [
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{
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"defaultStatus": "affected",
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"vendor": "libssh2",
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"product": "libssh2",
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"packageURL": "pkg:github/libssh2/libssh2",
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"repo": "https://github.com/libssh2/libssh2",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"versionType": "semver",
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"lessThanOrEqual": "1.11.1"
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},
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{
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"status": "unaffected",
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"version": "a2ed82d40964bbc0d64cd717aa0a5a892117d2e6",
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"versionType": "git"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*",
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"versionEndIncluding": "1.11.1"
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}
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]
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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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"cvssV4_0": {
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "HIGH",
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"subAvailabilityImpact": "NONE",
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"exploitMaturity": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
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"version": "4.0",
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"baseSeverity": "HIGH",
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"baseScore": 8.7,
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
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}
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},
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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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"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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"version": "3.1",
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"baseSeverity": "HIGH",
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"baseScore": 7.5,
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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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}
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}
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],
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"references": [
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{
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"url": "https://github.com/libssh2/libssh2/pull/2401",
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"name": "Pull Request",
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"tags": [
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"issue-tracking",
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"patch"
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]
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},
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{
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"url": "https://github.com/libssh2/libssh2/commit/a2ed82d40964bbc0d64cd717aa0a5a892117d2e6",
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"name": "Patch Commit",
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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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"url": "https://www.vulncheck.com/advisories/libssh2-integer-underflow-dos-via-aes-gcm-cipher-negotiation",
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"tags": [
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"third-party-advisory"
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]
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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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"value": "VladimirEliTokarev",
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"type": "finder"
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}
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],
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"source": {
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"discovery": "UNKNOWN"
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},
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"x_generator": {
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"engine": "vulncheck"
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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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"timestamp": "2026-07-27T16:15:25.211388Z",
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"id": "CVE-2026-66033",
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2026-07-27T16:18:57.172Z"
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}
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}
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]
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}
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} |