235 lines
12 KiB
JSON
235 lines
12 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-2025-40158",
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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": "2025-04-16T07:20:57.176Z",
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"datePublished": "2025-11-12T10:23:29.516Z",
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"dateUpdated": "2026-10-30T12:22:53.554Z"
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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": "2026-10-30T12:22:53.554Z"
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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\nipv6: use RCU in ip6_output()\n\nUse RCU in ip6_output() in order to use dst_dev_rcu() to prevent\npossible UAF.\n\nWe can remove rcu_read_lock()/rcu_read_unlock() pairs\nfrom ip6_finish_output2()."
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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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.1,
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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:N - `ip6_output()` is the IPv6 egress path for *forwarded* packets — `ip6_forward()` → `ip6_forward_finish()` → `dst_output()` → `ip6_output()` — so a remote, unauthenticated attacker's IPv6 traffic drives the vulnerable function on any Linux router, gateway, or container/cloud host, matching sibling CVE-2025-40168 in the same dst_dev_rcu series.\nAC:H - The remote attacker supplies the traffic side of the race freely, but the `dst_dev_put()` side (netdev unregister/link down, veth deletion, route-exception teardown) is an operational event they cannot influence from the network, and the freed `inet6_dev`/`net_device` must be reallocated with useful content to escalate beyond a crash.\nPR:N - Packets on the forwarding path reach `ip6_output()` with no credentials, no socket, and no local account on the target — the router transmits them automatically. (Even in the purely local framing the netns/CAP_NET_ADMIN half is obtainable via `unshare -Urn`, so no real privilege is required either way.)\nUI:N - Transmission and forwarding happen unconditionally in softirq/process context on packet arrival; no administrator or local user has to open, mount, or click anything.\nS:U - The freed `inet6_dev` and `net_device` are kernel objects and the corruption stays within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of `idev->cnf.disable_ipv6`, `idev->stats.ipv6`, `dev->hard_header_len`/`needed_headroom`, `dev->header_ops` and `dev->flags`; once the freed slab object is reallocated the attacker can steer header-expansion sizes and the egress device, yielding kernel memory disclosure and out-of-device packet leakage.\nI:H - `IP6_INC_STATS`/`IP6_UPD_PO_STATS` expand to `SNMP_INC_STATS64(idev->stats.ipv6, field)`, performing a 64-bit increment through a per-CPU pointer loaded from freed memory — an arbitrary-write primitive after reallocation — and `neigh_output()` → `dev_queue_xmit()` makes an indirect call through `dev->netdev_ops->ndo_start_xmit` read from the freed `net_device`, giving control-flow hijack.\nA:H - Dereferencing a freed `inet6_dev`/`net_device` on the packet transmit path reliably oopses or panics the kernel (KASAN slab-use-after-free), and the crash is in the core IPv6 output path so it takes down the whole forwarding host."
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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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"net/ipv6/ip6_output.c"
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],
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"versions": [
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{
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"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36",
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"lessThan": "4549ce1057363c8dc072f40c6aa591c279eafed2",
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"status": "affected",
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"versionType": "git"
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{
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"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36",
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"lessThan": "423895685f367b5a0a956bd14b02df0192bded4c",
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"status": "affected",
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"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36",
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"lessThan": "92803b826e40e49a5e8a6e208f4b4574e9d19426",
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"status": "affected",
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{
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"status": "affected",
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{
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"lessThan": "11709573cc4e48dc34c80fc7ab9ce5b159e29695",
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"status": "affected",
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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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"net/ipv6/ip6_output.c"
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],
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"versions": [
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{
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"version": "4.13",
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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": "4.13",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.113",
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"lessThanOrEqual": "6.12.*",
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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": "6.17.3",
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"lessThanOrEqual": "6.17.*",
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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": "6.18",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.13",
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"versionEndExcluding": "6.1.191"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/4549ce1057363c8dc072f40c6aa591c279eafed2"
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},
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{
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"url": "https://git.kernel.org/stable/c/423895685f367b5a0a956bd14b02df0192bded4c"
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},
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{
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"url": "https://git.kernel.org/stable/c/92803b826e40e49a5e8a6e208f4b4574e9d19426"
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},
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{
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"url": "https://git.kernel.org/stable/c/0393f85c3241c19ba8550f04a812e7d19f6b3082"
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{
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"url": "https://git.kernel.org/stable/c/11709573cc4e48dc34c80fc7ab9ce5b159e29695"
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}
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],
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"title": "ipv6: use RCU in ip6_output()",
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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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"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": "2026-06-16T20:00:29.008533Z",
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"id": "CVE-2025-40158",
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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": "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": "2026-06-16T20:00:37.150Z"
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}
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}
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]
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}
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} |