The Bzrtp library (aka libbzrtp) 1.0.x before 1.0.4 allows man-in-the-middle attackers to conduct spoofing attacks by leveraging a missing…

published 2017-01-18 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7201

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.2%; EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits: 0; none known

The Bzrtp library (aka libbzrtp) 1.0.x before 1.0.4 allows man-in-the-middle attackers to conduct spoofing attacks by leveraging a missing HVI check on DHPart2 packet reception.

Patch / fix

distros 2 links 1

debian ubuntu

bzrtp Debian 14, Debian 13, Debian 12 1.0.2-1.2

debian advisories DEBIAN-CVE-2016-6271

bzrtp Ubuntu 16.04 LTS 1.0.2-1.2build0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-6271

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

github.com/BelledonneCommunications/bzrtp@bbb1e6e commit

Exploit prediction

2.23% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-254 7PK - Security Features

References

github.com /BelledonneCommunications/bzrtp/commit/bbb1e6e2f467ee4bd7b9a8c800e4f07343d7d99b
issue-tracking, patch
securityfocus.com /bid/95928
vdb-entry
github.com /gteissier/CVE-2016-6271

Sources

CVE List CVE-2016-6271
NVD CVE-2016-6271

Fencer Vulns 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.

Summary