RHSA-2026:67878
Vulnerability from csaf_redhat - Published: 2026-09-16 10:10 - Updated: 2026-09-16 13:22Summary
Red Hat Security Advisory: corosync security update
Severity
Important
Notes
Topic: An update for corosync is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The corosync packages provide the Corosync Cluster Engine and C APIs for Red Hat Enterprise Linux cluster software.
Security Fix(es):
* corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly (CVE-2026-81665)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control.
7.5 (High)
Affected products
Fixed
68 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.src | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosynclib-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosynclib-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.aarch64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.aarch64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.aarch64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.aarch64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-0:3.1.8-1.el9_4.2.aarch64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.aarch64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.aarch64 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: HighAvailability-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-debugsource-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosync-vqsim-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-debuginfo-0:3.1.8-1.el9_4.2.x86_64 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.i686 | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.ppc64le | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.s390x | — |
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| Unresolved product id: ResilientStorage-9.4.0.Z.E4S:corosynclib-devel-0:3.1.8-1.el9_4.2.x86_64 | — |
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Threats
Impact
Important
References
8 references
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"category": "description",
"text": "A heap-based buffer overflow was found in Corosync\u0027s Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control.",
"title": "Vulnerability description"
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{
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"text": "corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "This vulnerability is rated as Important. The published Red Hat CVSS score is 7.5 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H), matching the unmitigated upstream baseline.\n\nRHEL High Availability Add-On clusters are configured via the pcs (Pacemaker/Corosync configuration system) tool, whose \u0027pcs cluster setup\u0027 command has defaulted to generating a corosync.conf with crypto_hash=sha256 and crypto_cipher=aes256 for multiple RHEL 8.x and 9.x releases, which meaningfully reduces real-world risk by requiring an attacker to already possess the cluster\u0027s shared authentication key before the vulnerable code is ever reached. This has been confirmed directly with upstream corosync maintainer Jan Friesse (2026-08-31). However, Jan also confirmed that for RHEL \u003c=10 this protection is a configurable default rather than an enforced, non-optional control: an administrator can disable it via the officially supported \u0027pcs\u0027 interface itself (setting cipher=none, hash=none), not only via unsupported manual editing of corosync.conf. Because encryption can be turned off through a supported configuration path, Red Hat is publishing the CVSS score for the worst-case supported configuration (encryption disabled) rather than crediting the default as a permanent mitigating factor.\n\nAdministrators who have not explicitly disabled cluster message authentication benefit from a substantially reduced practical risk, equivalent to CVSS 6.4 (CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H), since the knet transport rejects unauthenticated packets before they reach the vulnerable reassembly code. See the Mitigation section for guidance on confirming and enforcing this configuration.\n\nCorosync is shipped in Red Hat Enterprise Linux 7 through 10 and RHIVOS as part of the High Availability Add-On. Firewalld\u0027s high-availability service definition (covering the affected knet ports) is not enabled by default, providing additional network-layer defense in depth on systems where firewalld is active. SELinux, enforcing by default on RHEL, confines the corosync_t domain\u0027s file writes to corosync-specific paths and restricts network access to UDP only, limiting post-exploitation options, though the domain retains capabilities broad enough that this is not treated as a complete mitigation for CVSS scoring purposes.\n\nNote: upstream corosync HEAD and current Fedora (which will become RHEL 11) now enforce encryption at compile time, removing the ability to disable it entirely without recompiling from source. Once this reaches RHEL as a supported release, this compensating control will become a true enforced guarantee rather than a configurable default, and the published score is expected to be revisited at that time.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2026:67878"
},
{
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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