CVE-2025-61103: frrouting Null Dereference

Description

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

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
frrouting	frrouting	4.0 — 10.4.1

References

Advisories & Patches

https://github.com/FRRouting/frr/pull/19480/commits/fdd957408605d4a1766225630aafc7e6b7c3daf3

Exploits

https://github.com/FRRouting/frr/issues/19471

Other References

https://github.com/FRRouting/frr/pull/19480 https://github.com/s1awwhy/BugList/blob/main/CVE-2025-61103.md

Frequently Asked Questions

What is CVE-2025-61103? +

FRRouting/frr from v4.0 through v10.4.1 was discovered to contain a NULL pointer dereference via the show_vty_ext_link_lan_adj_sid function at ospf_ext.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted OSPF packet. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-61103? +

CVE-2025-61103 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-61103? +

CVE-2025-61103 affects products from frrouting, specifically: frrouting. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-61103? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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