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Fencer Intel
medium 6.8

CVE-2025-43972 json

GoBGP crashes in the flowspec parser

published last yr. modified last mo. also EUVD-2025-12348 , GHSA-mfvv-mgf6-q25r , GO-2025-3632

cvss
6.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

An issue was discovered in GoBGP before 3.35.0. An attacker can cause a crash in the pkg/packet/bgp/bgp.go flowspec parser by sending fewer than 20 bytes in a certain context.

Patch / fix

  • go github.com/osrg/gobgp/v3 3.35.0
  • GoBGP GoBGP 3.35.0
  • gobgp Debian 14, Debian 13 3.35.0-1

debian advisories DEBIAN-CVE-2025-43972

  • gobgp Ubuntu Pro 18.04 LTS 1.29-1ubuntu0.1+esm1
  • gobgp Ubuntu Pro 20.04 LTS 2.12.0-1ubuntu0.1~esm2
  • gobgp Ubuntu Pro 22.04 LTS 2.25.0-3ubuntu0.1+esm2
  • gobgp Ubuntu Pro 24.04 LTS 3.23.0-1ubuntu0.3+esm2

ubuntu advisories UBUNTU-CVE-2025-43972

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250422T181640-1.1

opensuse advisories openSUSE-SU-2025:15017-1

Is CVE-2025-43972 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
GitHub 3.1 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/osrg/gobgp
all versions
 no fix listed
go github.com/osrg/gobgp/v3
<3.35.0
3.35.0

Affected products

  • GoBGP GoBGP

Classification

Weakness
  • CWE-1284 Improper Validation of Specified Quantity in Input

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.