What is CVE-2025-43971?

CVE-2025-43971 is a high-severity vulnerability in Gobgp, classified under Off-by-one Error. CVSS score: 8.6/10. Published 2025-04-21.

How severe is CVE-2025-43971?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Gobgp

CVE-2025-43971

An issue was discovered in GoBGP before 3.35.0. pkg/packet/bgp/bgp.go allows attackers to cause a panic via a zero value for softwareVersionLen.

Published 2025-04-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.0th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000

Affected products

Gobgp — versions 0
Osrg Gobgp

Weakness classification (CWE)

CWE-193 — Off-by-one Error

References

github.com/osrg/gobgp/compare/v3.34.0...v3.35.0 (Patch, Release Notes)
github.com/osrg/gobgp/commit/08a001e06d90e8bcc190084c66992f46f62c0986 (Patch)

Frequently asked questions

What is CVE-2025-43971?: CVE-2025-43971 is a high-severity vulnerability in Gobgp, classified under Off-by-one Error. CVSS score: 8.6/10. Published 2025-04-21.
How severe is CVE-2025-43971?: High severity. CVSS v3 base score is 8.6 out of 10.