CVE-2022-40318

Name: CVE-2022-40318
Creator: NVD / NIST
Published: 2023-05-03T12:16:27.8+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.98%

Last modified Jun 17, 2026

CVE-2022-40318 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in bgpd in FRRouting (FRR) through 8.4. By crafting a BGP OPEN message with an option of type 0xff (Extended Length from RFC 9072), attackers may cause a denial of service (assertion failure and daemon restart, or out-of-bounds read). EPSS estimates a 1.98% chance of exploitation in the next 30 days.

Description

An issue was discovered in bgpd in FRRouting (FRR) through 8.4. By crafting a BGP OPEN message with an option of type 0xff (Extended Length from RFC 9072), attackers may cause a denial of service (assertion failure and daemon restart, or out-of-bounds read). This is possible because of inconsistent boundary checks that do not account for reading 3 bytes (instead of 2) in this 0xff case. NOTE: this behavior occurs in bgp_open_option_parse in the bgp_open.c file, a different location (with a different attack vector) relative to CVE-2022-40302.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.98%

78.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Frrouting	Frrouting	<= 8.4
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0
Debian	Debian Linux	12.0

References

https://github.com/FRRouting/frr/releasesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00020.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2023/dsa-5495Third Party Advisory
https://github.com/FRRouting/frr/releasesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00020.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2023/dsa-5495Third Party Advisory

Timeline

Published: May 3, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-40318?

How severe is CVE-2022-40318?

CVE-2022-40318 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.98% probability of exploitation in the next 30 days.

How do I fix CVE-2022-40318?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-40318?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST