CVE-2025-61101

Publication date 27 October 2025

Last updated 12 February 2026

Ubuntu priority

Cvss 3 Severity Score

Description

FRRouting/frr from v4.0 through v10.4.1 was discovered to contain a NULL pointer dereference via the show_vty_ext_link_rmt_itf_addr function at ospf_ext.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted OSPF packet.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
frr	25.10 questing	Vulnerable
	25.04 plucky	Ignored end of life, was deferred [2026-01-12]
	24.04 LTS noble	Vulnerable
	22.04 LTS jammy	Vulnerable
	20.04 LTS focal	Vulnerable
quagga	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Vulnerable
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Vulnerable

Notes

sbeattie

the quagga project was renamed to frr

mdeslaur

commits below fix CVE-2025-61099 to CVE-2025-61107

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
frr	Upstream: https://github.com/FRRouting/frr/pull/19983 Upstream: b7d9b7a Upstream: 034e6fe Upstream: 33dfc7e Upstream: 4e59658

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H