200 lines
10 KiB
JSON
200 lines
10 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-2025-39888",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.145Z",
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"datePublished": "2025-09-23T06:00:54.156Z",
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"dateUpdated": "2026-08-05T12:05:54.198Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:05:54.198Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: Block access to folio overlimit\n\nsyz reported a slab-out-of-bounds Write in fuse_dev_do_write.\n\nWhen the number of bytes to be retrieved is truncated to the upper limit\nby fc->max_pages and there is an offset, the oob is triggered.\n\nAdd a loop termination condition to prevent overruns."
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}
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],
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"metrics": [
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is reached by a local process writing a FUSE_NOTIFY_RETRIEVE message to an open /dev/fuse file descriptor; no network or physical access is involved.\nAC:L - Every parameter that determines the overflow is attacker-controlled — max_pages and max_write via the FUSE_INIT reply, file size via attribute replies, page-cache residency via FUSE_NOTIFY_STORE, and the intra-page offset via the notify message — making the overflow deterministic and repeatable.\nPR:L - An unprivileged local user suffices: FUSE is flagged FS_USERNS_MOUNT so a mount can be created inside an unprivileged user namespace (unshare -Ur), and the setuid fusermount helper offers the same on typical distros; the notify path itself has no capability check.\nUI:N - The attacker acts as both the FUSE server and the client, populating the page cache from the server side via FUSE_NOTIFY_STORE and issuing the malicious retrieve notification itself, so no victim action is needed.\nS:U - The heap corruption occurs in kernel memory belonging to the same security authority as the attacking process; this is standard kernel privilege escalation with no crossing of a hypervisor or IOMMU boundary.\nC:H - Overwriting descs[0] with a folio pointer yields a ~0xffffea00 byte offset passed to kmap_local_folio(), causing a large out-of-bounds kernel read whose contents are copied straight into the attacker's userspace read() buffer on /dev/fuse.\nI:H - This is a slab out-of-bounds write of 8 attacker-influenced bytes past the kzalloc'd allocation, and because the attacker tunes max_pages to land the allocation exactly on a kmalloc bucket boundary the write corrupts an adjacent slab object — a classic heap-corruption primitive for privilege escalation.\nA:H - The out-of-bounds write plus the resulting wild-pointer read from a bogus folio offset reliably produce memory corruption and an oops/panic, as demonstrated by the KASAN-detected slab-out-of-bounds write in the syzbot reproducer."
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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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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/fuse/dev.c"
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],
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"versions": [
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{
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"version": "3568a956932621cafadafc8b75fcf6dc06555105",
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"lessThan": "623719227b114d73a2cee45f1b343ced63ce09ec",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3568a956932621cafadafc8b75fcf6dc06555105",
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"lessThan": "9d81ba6d49a7457784f0b6a71046818b86ec7e44",
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"status": "affected",
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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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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/fuse/dev.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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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": "6.16.8",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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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:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.16.8"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.17"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/623719227b114d73a2cee45f1b343ced63ce09ec"
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},
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{
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"url": "https://git.kernel.org/stable/c/9d81ba6d49a7457784f0b6a71046818b86ec7e44"
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}
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],
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"title": "fuse: Block access to folio overlimit",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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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-2025-39888",
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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": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-01-14T19:26:55.986332Z"
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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-787",
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"description": "CWE-787 Out-of-bounds Write"
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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": "2026-01-14T19:33:13.183Z"
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}
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}
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]
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}
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} |