# CVE-2025-43973: gobgp: An issue was discovered in GoBGP before 3.35.0

CVE-2025-43973 is fixed in 3 products on 1 platform, first by gobgpd 1.29-1ubuntu0.1+esm1, released April 20, 2025. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2025-43973
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0057
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 20, 2025

## Description

An issue was discovered in GoBGP before 3.35.0. pkg/packet/rtr/rtr.go does not verify that the input length corresponds to a situation in which all bytes are available for an RTR message.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gobgp Debian 13.5 (trixie) | 3.35.0-1 | [DEBIAN-CVE-2025-43973](https://patchblox.com/security/data/fix/linux/debian-cve-2025-43973.md) | Apr 21, 2025 |
| Linux | gobgp Debian 14 | 3.35.0-1 | [DEBIAN-CVE-2025-43973](https://patchblox.com/security/data/fix/linux/debian-cve-2025-43973.md) | Apr 21, 2025 |
| Linux | gobgpd Ubuntu 18.04.6 LTS (bionic) | 1.29-1ubuntu0.1+esm1 | [gobgpd 1.29-1ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gobgpd-1.29-1ubuntu0.1-esm1.md) | Apr 20, 2025 |
| Linux | gobgpd Ubuntu 20.04 LTS (focal) | 2.12.0-1ubuntu0.1~esm2 | [gobgpd 2.12.0-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gobgpd-2.12.0-1ubuntu0.1-esm2.md) | Apr 20, 2025 |
| Linux | gobgpd Ubuntu 22.04.1 LTS (jammy) | 2.25.0-3ubuntu0.1+esm2 | [gobgpd 2.25.0-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gobgpd-2.25.0-3ubuntu0.1-esm2.md) | Apr 20, 2025 |
| Linux | gobgpd Ubuntu 24.04.5 LTS (noble) | 3.23.0-1ubuntu0.3+esm2 | [gobgpd 3.23.0-1ubuntu0.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gobgpd-3.23.0-1ubuntu0.3-esm2.md) | Apr 20, 2025 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 18.04.6 LTS (bionic) | 1.29-1ubuntu0.1+esm1 | [golang-github-osrg-gobgp-dev 1.29-1ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-github-osrg-gobgp-dev-1.29-1ubuntu0.1-esm1.md) | Apr 20, 2025 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 20.04 LTS (focal) | 2.12.0-1ubuntu0.1~esm2 | [golang-github-osrg-gobgp-dev 2.12.0-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-github-osrg-gobgp-dev-2.12.0-1ubuntu0.1-esm2.md) | Apr 20, 2025 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 22.04.1 LTS (jammy) | 2.25.0-3ubuntu0.1+esm2 | [golang-github-osrg-gobgp-dev 2.25.0-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-github-osrg-gobgp-dev-2.25.0-3ubuntu0.1-esm2.md) | Apr 20, 2025 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 24.04.5 LTS (noble) | 3.23.0-1ubuntu0.3+esm2 | [golang-github-osrg-gobgp-dev 3.23.0-1ubuntu0.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-github-osrg-gobgp-dev-3.23.0-1ubuntu0.3-esm2.md) | Apr 20, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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