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CVE-2023-38406VulnerabilityPublished Updated

CVE-2023-38406: frr · n/a

Affects frrSource CVE Database V5

0

Not known to be exploited : upgrade to 8.4.3 soon.

Data as of 26 Oct 2026, 06:26 UTC

Severity
High

Rated High by the CNA (mitre) · No CVSS score from NVD or the CNA

EPSS
0.9% chance of exploitation in 30 days – higher than 60% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 8.4.3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2023

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Upgrade frrouting/frr to 8.4.3.

Affected software

ProductAffectedFixed in
GitHubfrrouting/frrpkg:github/frrouting/frrOther threatsAffected
  • <8.4.3
Fixed in
  • 8.4.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade FRRouting to version 8.4.3 or later, where this vulnerability has been fixed. No other mitigation or temporary workaround is indicated.

Description

CVE-2023-38406 is a vulnerability in FRRouting (FRR) versions prior to 8.4.3 where the bgpd/bgp_flowspec.c component mishandles an NLRI length of zero, leading to a flowspec overflow condition. This flaw was fixed in version 8.4.3.

References

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