CVE-2016-3947

Publication date 7 April 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Heap-based buffer overflow in the Icmp6::Recv function in icmp/Icmp6.cc in the pinger utility in Squid before 3.5.16 and 4.x before 4.0.8 allows remote servers to cause a denial of service (performance degradation or transition failures) or write sensitive information to log files via an ICMPv6 packet.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
squid3	16.04 LTS xenial	Fixed in 3.5.12-1ubuntu7.2
	15.10 wily	Fixed in 3.3.8-1ubuntu16.3
	14.04 LTS trusty	Fixed in 3.3.8-1ubuntu6.8
	12.04 LTS precise	Fixed in 3.1.19-1ubuntu3.12.04.7

Patch details

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

Package	Patch details
squid3	Upstream: http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10495.patch Upstream: http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12694.patch Upstream: http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14015.patch

Severity score breakdown

CVSS version: CVSS v3.0

Base score 8.2 · High

Base metrics

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

Scores

Parameter	Value
Base score	8.2 · High
Exploitability score	-
Impact score	-

CVE-2016-3947

Cvss 3 Severity Score

Description

Status

Patch details

Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities