What is CVE-2025-61103?

CVE-2025-61103 is a high-severity vulnerability in Frrouting, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-10-28.

How severe is CVE-2025-61103?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Frrouting

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.

Published 2025-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Frrouting

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/FRRouting/frr/pull/19480 (Third Party Advisory, Issue Tracking)
github.com/FRRouting/frr/issues/19471 (Exploit, Third Party Advisory, Issue Tracking)
github.com/FRRouting/frr/pull/19480/commits/fdd957408605d4a1766225630aafc7e6b7c… (Patch)
github.com/s1awwhy/BugList/blob/main/CVE-2025-61103.md (Third Party Advisory)

Frequently asked questions

What is CVE-2025-61103?: CVE-2025-61103 is a high-severity vulnerability in Frrouting, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-10-28.
How severe is CVE-2025-61103?: High severity. CVSS v3 base score is 7.5 out of 10.