CVE-2016-6271

HIGH

libbzrtp 1.0.x < 1.0.4 - Man-in-the-Middle Spoofing via Missing HVI Check on DHPart2 Packet

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-6271. PoCs published by gteissier.

AI-analyzed exploit summary This repository contains a functional proof-of-concept exploit for CVE-2016-6271, demonstrating a man-in-the-middle attack against libbzrtp due to the absence of hash-commitment verification in the ZRTP protocol. The exploit includes Dockerized vulnerable and attacker components to simulate the attack scenario.

Description

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.

Exploits (1)

nomisec WORKING POC 4 stars
by gteissier · poc
https://github.com/gteissier/CVE-2016-6271

This repository contains a functional proof-of-concept exploit for CVE-2016-6271, demonstrating a man-in-the-middle attack against libbzrtp due to the absence of hash-commitment verification in the ZRTP protocol. The exploit includes Dockerized vulnerable and attacker components to simulate the attack scenario.

Classification
Working Poc 95%
Attack Type
Other
Complexity
Moderate
Reliability
Reliable
Target: libbzrtp (ZRTP library)
No auth needed
Prerequisites: Docker · Python3 · Scapy
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (3)

Core 3
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/95928
Various Sources x_refsource_misc
https://github.com/gteissier/CVE-2016-6271

Scores

CVSS v3 7.5
EPSS 0.0223
EPSS Percentile 80.6%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-254
Status published
Products (3)
bzrtp_project/bzrtp 1.0.0
bzrtp_project/bzrtp 1.0.2
bzrtp_project/bzrtp 1.0.3
Published Jan 18, 2017
Tracked Since Feb 18, 2026