What’s Vulnerable › Vulnerabilities

CVE-2023-38406

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-06 · updated 2026-06-17
• Weakness: CWE-755

Description

bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow."

Affected products

• FRRouting: before 8.4.3 — fixed in 8.4.3

How to fix

Upgrade to a fixed version: FRRouting 8.4.3. Check the vendor advisory for mitigations.

References

• https://github.com/FRRouting/frr/compare/frr-8.4.2...frr-8.4.3
• https://github.com/FRRouting/frr/pull/12884
• https://lists.debian.org/debian-lts-announce/2024/04/msg00019.html
• https://github.com/FRRouting/frr/compare/frr-8.4.2...frr-8.4.3
• https://github.com/FRRouting/frr/pull/12884
• https://lists.debian.org/debian-lts-announce/2024/04/msg00019.html
• https://lists.debian.org/debian-lts-announce/2024/09/msg00007.html

Get alerted when CVE-2023-38406 or the next vulnerability affects your stack