CVE-2016-2851

Publication date 9 March 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Integer overflow in proto.c in libotr before 4.1.1 on 64-bit platforms allows remote attackers to cause a denial of service (memory corruption and application crash) or execute arbitrary code via a series of large OTR messages, which triggers a heap-based buffer overflow.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libotr	15.10 wily	Fixed 4.1.0-2ubuntu0.1
	14.04 LTS trusty	Fixed 4.0.0-2.2ubuntu1.1
	12.04 LTS precise	Fixed 3.2.0-4ubuntu0.3

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.8 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	9.8 · Critical
Exploitability score	-
Impact score	-

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-2926-1
OTR vulnerability
10 March 2016