CVE-2016-9963

Publication date 16 December 2016

Last updated 25 August 2025

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via vectors related to log files and bounce messages.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
exim4	16.10 yakkety	Fixed 4.87-3ubuntu1.1
	16.04 LTS xenial	Fixed 4.86.2-2ubuntu2.1
	14.04 LTS trusty	Fixed 4.82-3ubuntu2.2
	12.04 LTS precise	Fixed 4.76-3ubuntu3.4

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
exim4	Upstream: 87cb4a1 Upstream: 46672dc Upstream: fd3961f Upstream: be2b8e5 Upstream: 31c02de Upstream: f915863

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.9 · Medium

Base metrics

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

Scores

Parameter	Value
Base score	5.9 · Medium
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-3164-1
Exim vulnerability
5 January 2017

Other references

Access our resources on patching vulnerabilities