Disclosure summary
FRRouting/frr from v4.0 through v10.4.1 was discovered to contain a NULL pointer dereference via the show_vty_link_info function at ospf_ext.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted OSPF packet.
Source-reported weakness categories
CWE-476
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2025-Oct
Open original source · Updated Feb 17, 2026
FRRouting/frr from v4.0 through v10.4.1 was discovered to contain a NULL pointer dereference via the show_vty_link_info function at ospf_ext.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted OSPF packet.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 7.5
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 frr 9.1.1-4 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 frr 9.1.1-5 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 frr 9.1.1-3 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 9.1.1-5 · product IDs 20875-17084
- Vendor guidance · product IDs 20875-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2025-10-30T21:11:21-04:00
MODIFIED 2026-02-17T21:43:12-05:00
INGESTED 2026-10-08T12:45:38-04:00