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Fencer Intel
medium 6.5

CVE-2024-31951 json

In the Opaque LSA Extended Link parser in FRRouting (FRR) through 9.1, there can be a buffer overflow and daemon crash in ospf_te_parse_ext…

published 2y ago modified 4mo ago also EUVD-2024-29809

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

In the Opaque LSA Extended Link parser in FRRouting (FRR) through 9.1, there can be a buffer overflow and daemon crash in ospf_te_parse_ext_link for OSPF LSA packets during an attempt to read Segment Routing Adjacency SID subTLVs (lengths are not validated).

Patch / fix

  • frr Debian 12 8.4.4-1.1~deb12u2
  • frr Debian 13 10.3-3+deb13u1
  • frr Debian 14 10.0.1-0.1

debian advisories DEBIAN-CVE-2024-31951

  • frr Ubuntu 22.04 LTS 8.1-1ubuntu1.10
  • frr Ubuntu 24.04 LTS 8.4.4-1.1ubuntu6.1

ubuntu advisories UBUNTU-CVE-2024-31951

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • frr SLE Module for Server Applications 15 SP6, SLE Module for Server Applications 15 SP5, openSUSE Leap 15.6 +1 more 8.5.6-150500.4.30.1
  • frr SLE Module for Server Applications 15 SP6, SLE Module for Server Applications 15 SP5, openSUSE Leap 15.6 +1 more 8.4-150500.4.23.1

suse advisories SUSE-SU-2024:4090-1SUSE-SU-2024:1971-1

  • frr openSUSE Tumbleweed 8.4-12.1

opensuse advisories openSUSE-SU-2024:14038-1

  • frr CBL-Mariner 2.0 8.5.5-1

azure linux advisories AZL-39815

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2024-31951 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-31951 updated cvss 7.0

frr: buffer overflow in ospf_te_parse_ext_link

  • Red Hat Enterprise Linux 8 frr, frr-contrib, frr-selinux Red Hat Enterprise Linux 9 frr, frr-selinux
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 10 frr
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2y ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.