CVE-2023-38406: frr · CVE-2023-38406 is a
Affects frrSource CVE Database V5
Not known to be exploited : upgrade to 8.4.3 soon.
Data as of 26 Oct 2026, 17:16 UTC
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
Disclosed: evidence found.
CVE published 6 Nov 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 26 Oct 2026.
What to do
Upgrade frrouting/frr to 8.4.3.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubfrrouting/frrpkg:github/frrouting/frrOther threats | Affected
| Fixed in
|
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.