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-2023-53733",
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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": "2025-10-22T13:21:37.350Z",
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"datePublished": "2025-10-24T11:44:28.115Z",
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"dateUpdated": "2026-10-30T12:17:33.672Z"
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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": "2026-10-30T12:17:33.672Z"
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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: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode\n\nWhen u32_replace_hw_knode fails, we need to undo the tcf_bind_filter\noperation done at u32_set_parms."
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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 vulnerable path is reached through the rtnetlink `RTM_NEWTFILTER` interface (tc filter add/change) on the local system; no network peer can drive filter configuration. Packet transmission only serves to consume the corrupted state afterwards.\nAC:L - Failure of `u32_replace_hw_knode()` is fully attacker-controlled — setting the `skip_sw` flag on a filter attached to a non-offload-capable device (dummy/veth/lo) makes `tc_setup_cb_add()` return `-EOPNOTSUPP` deterministically on every attempt, with no race and no dependence on state outside the attacker's control.\nPR:L - Only `CAP_NET_ADMIN` within a network namespace is needed, which any unprivileged local user obtains with `unshare -Urn` before creating a dummy device, an HTB qdisc with classes, and u32 filters. Per kernel CNA guidance, tc/qdisc paths reachable via user namespaces are PR:L, not PR:H.\nUI:N - The attacker performs the entire sequence (create qdisc/class, repeatedly issue the failing filter add, delete the class, send traffic) unaided. No victim action is required at any point.\nS:U - The corrupted `filter_cnt` accounting and the resulting freed `htb_class` object both live in the kernel of the same machine, so the impact stays within a single security authority. This is standard kernel-local privilege escalation, not a hypervisor or IOMMU boundary crossing.\nC:H - The refcount imbalance permits a still-referenced traffic class to be freed while `res.class` remains a dangling pointer consumed by `htb_classify()`, giving a use-after-free on a slab object the attacker can reallocate and read back. Per guidance, a UAF that grants control over freed-object contents is High confidentiality impact.\nI:H - The same use-after-free lets a sprayed replacement object supply `cl->level`, `cl->leaf.q` and the qdisc function pointers dereferenced in the enqueue path, yielding a write/control-flow-hijack primitive — the same primitive that produced working local privilege escalation for the sibling cls_u32 tcf_result bugs. Type-confused/UAF corruption of kernel objects is High integrity impact.\nA:H - Even without exploitation, the leaked `filter_cnt` permanently pins the class and its qdisc so `tc class del` always returns `-EBUSY` and the memory is never reclaimed, and the dangling `res.class` dereference in the packet enqueue path oopses the kernel. Any kernel crash or use-after-free is High availability impact."
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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/sched/cls_u32.c"
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],
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"versions": [
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{
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"version": "d34e3e181395192d6d1f50dd97bd7854e04e33a4",
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"lessThan": "d83345a8c0143ea31822be0aeb91a63bfc58215e",
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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": "d34e3e181395192d6d1f50dd97bd7854e04e33a4",
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"lessThan": "3d5edcd3bca4aff15a18e45c79df1525059ab0e2",
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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": "d34e3e181395192d6d1f50dd97bd7854e04e33a4",
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"lessThan": "a9345793469b65ee5ba7b033239916c2a67d3dd4",
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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": "d34e3e181395192d6d1f50dd97bd7854e04e33a4",
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"lessThan": "025159ed118ba5145b241d574edadb0e00d3c20f",
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"status": "affected",
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"versionType": "git"
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{
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"version": "d34e3e181395192d6d1f50dd97bd7854e04e33a4",
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"lessThan": "9cb36faedeafb9720ac236aeae2ea57091d90a09",
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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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"net/sched/cls_u32.c"
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],
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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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},
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{
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"version": "0",
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"lessThan": "4.7",
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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": "5.10.273",
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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": "5.15.224",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.42",
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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": "6.4.7",
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"lessThanOrEqual": "6.4.*",
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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": "6.5",
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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": "4.7",
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"versionEndExcluding": "5.10.273"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.7",
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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/d83345a8c0143ea31822be0aeb91a63bfc58215e"
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},
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{
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"url": "https://git.kernel.org/stable/c/3d5edcd3bca4aff15a18e45c79df1525059ab0e2"
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},
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{
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"url": "https://git.kernel.org/stable/c/a9345793469b65ee5ba7b033239916c2a67d3dd4"
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},
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{
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"url": "https://git.kernel.org/stable/c/025159ed118ba5145b241d574edadb0e00d3c20f"
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},
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{
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"url": "https://git.kernel.org/stable/c/9cb36faedeafb9720ac236aeae2ea57091d90a09"
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}
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],
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"title": "net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode",
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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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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-53733",
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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": "2026-10-15T21:36:55.863710Z"
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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": "2026-10-15T21:41:35.062Z"
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}
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}
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]
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}
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} |