CVE-2025-43971 GoBGP panics due to a zero value for softwareVersionLen
Attackers can cause a panic in GoBGP by sending a BGP packet with a zero softwareVersionLen, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-43971?
CVE-2025-43971 is a high-severity denial of service vulnerability in GoBGP, published on 21 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-193
Which versions are affected by CVE-2025-43971?
4 open source packages ship an affected version, including github.com/osrg/gobgp/v3 and github.com/osrg/gobgp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/osrg/gobgp/v3 Go | All versions | 3.35.0 |
github.com/osrg/gobgp/v3 Go | From 3.11.0 | 3.35.0 |
github.com/osrg/gobgp/v3 Go | From 3.11.0 | 3.35.0 |
github.com/osrg/gobgp Go | All versions | None |
Products include Osrg Gobgp.
How do I fix CVE-2025-43971?
Upgrade github.com/osrg/gobgp/v3 to 3.35.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-43971 being exploited?
There is no known exploitation of CVE-2025-43971 in the wild and no public exploit code.
Other vulnerabilities in GoBGP
- CVE-2026-41642 GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute
- CVE-2026-41643 GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
- CVE-2026-42285 GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)
- CVE-2026-37461 GoBGP has an out-of-bounds read in the ParseIP6Extended function
- CVE-2026-30405 GoBGP vulnerable to a denial of service via the NEXT_HOP path attribute
Sources
Also known as DEBIAN-CVE-2025-43971, GHSA-7m35-vw2c-696v, GO-2025-3631, MINI-745c-j377-9f93, MINI-ccww-7cv5-x3g4, UBUNTU-CVE-2025-43971.