317 lines
17 KiB
JSON
317 lines
17 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-2025-37756",
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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": "2025-04-16T04:51:23.938Z",
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"datePublished": "2025-05-01T12:56:00.539Z",
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"dateUpdated": "2026-10-15T21:51:59.284Z"
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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": "2026-08-05T11:57:19.159Z"
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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\nnet: tls: explicitly disallow disconnect\n\nsyzbot discovered that it can disconnect a TLS socket and then\nrun into all sort of unexpected corner cases. I have a vague\nrecollection of Eric pointing this out to us a long time ago.\nSupporting disconnect is really hard, for one thing if offload\nis enabled we'd need to wait for all packets to be _acked_.\nDisconnect is not commonly used, disallow it.\n\nThe immediate problem syzbot run into is the warning in the strp,\nbut that's just the easiest bug to trigger:\n\n WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n Call Trace:\n <TASK>\n tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363\n tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043\n inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678\n sock_recvmsg_nosec net/socket.c:1023 [inline]\n sock_recvmsg+0x109/0x280 net/socket.c:1045\n __sys_recvfrom+0x202/0x380 net/socket.c:2237"
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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 triggered by the socket owner issuing `connect(fd, AF_UNSPEC)` followed by `recvmsg()` on their own kTLS socket; a remote TLS peer has no way to induce a disconnect. The TCP connection can be entirely loopback, so no network access is needed at all.\nAC:L - The sequence (attach TLS ULP, receive one record so the strparser latches `msg_ready` with a borrowed `frag_list`, disconnect, recvmsg) is fully under the attacker's control, single-threaded, and deterministic with no race to win. Heap grooming of the freed `skbuff_head` objects is standard and repeatable since the attacker can retry indefinitely.\nPR:L - `net/tls` contains no `capable()`/`ns_capable()` checks whatsoever, and `setsockopt(TCP_ULP,\"tls\")` plus `TLS_RX` crypto_info are available to any unprivileged user once the tls module is built in or resident. All steps are ordinary socket syscalls on a socket the attacker created.\nUI:N - The attacker performs every step themselves within a single process; no victim action, mount, or file open is involved.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - `skb_nsg()`/`skb_to_sgvec()` walk the anchor's dangling `frag_list` into freed `skbuff_head` slab objects, building a scatterlist from attacker-sprayable page pointers; the zero-copy AEAD then writes those kernel bytes into the user's buffer before the tag check fails, and since the attacker chose the RX key/IV they recover the plaintext — an arbitrary kernel memory read.\nI:H - This is a use-after-free: `tls_strp_msg_hold()` performs `skb_clone()` on freed skbs (refcount writes into reallocated slab memory) and queues clones that are later freed, giving heap corruption and arbitrary-free primitives usable for control-flow hijack.\nA:H - The immediate observable effect is the `WARN_ON` at net/tls/tls_strp.c:486 (a panic under `panic_on_warn`), and the subsequent dereference of freed skb metadata and wild page pointers reliably oopses the kernel."
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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/tls/tls_main.c"
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],
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{
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"status": "affected",
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"status": "affected",
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"lessThan": "c665bef891e8972e1d3ce5bbc0d42a373346a2c3",
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"status": "affected",
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{
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"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
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"lessThan": "8513411ec321942bd3cfed53d5bb700665c67d86",
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"status": "affected",
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"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
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"lessThan": "5071a1e606b30c0c11278d3c6620cd6a24724cf6",
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"status": "affected",
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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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"programFiles": [
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"net/tls/tls_main.c"
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],
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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": "5.10.237",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.181",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.135",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.88",
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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": "6.12.24",
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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": "6.13.12",
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"lessThanOrEqual": "6.13.*",
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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": "6.14.3",
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"lessThanOrEqual": "6.14.*",
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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": "6.15",
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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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"cpeApplicability": [
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"url": "https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a"
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{
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"url": "https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6"
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"url": "https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6"
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}
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],
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"title": "net: tls: explicitly disallow disconnect",
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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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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
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}
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"shortName": "CVE",
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"dateUpdated": "2026-05-07T06:58:56.863Z"
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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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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-37756",
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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": "2026-10-15T21:44:56.970467Z"
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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": "2026-10-15T21:51:59.284Z"
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}
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}
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]
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}
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} |