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Vulnerability record · CVE-2016-3947 · published 7 April 2016

CVE-2016-3947: Squid-cache squid memory buffer overflow vulnerability

Squid Cache · Squid

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.

8.2 CVSS 3.0 High EPSS 15% · top 3.5% CWE-119 · Memory buffer overflow
8.2CVSS 3.0 base score, v2 7.5
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html
http://www.securitytracker.com/id/1035457
http://www.squid-cache.org/Advisories/SQUID-2016_3.txt Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10495.patch Patch
http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11839.patch PatchThird Party AdvisoryUS Government Resource
http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12694.patch Patch
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13232.patch Patch
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14015.patch Patch
http://www.ubuntu.com/usn/USN-2995-1
https://security.gentoo.org/glsa/201607-01
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html
http://www.securitytracker.com/id/1035457
http://www.squid-cache.org/Advisories/SQUID-2016_3.txt Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10495.patch Patch
http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11839.patch PatchThird Party AdvisoryUS Government Resource
http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12694.patch Patch
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13232.patch Patch
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14015.patch Patch
http://www.ubuntu.com/usn/USN-2995-1
https://security.gentoo.org/glsa/201607-01

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Source: NIST National Vulnerability Database (record CVE-2016-3947), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.