CVE-2016-4556
Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 23.1%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 23.11% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- squid-cache/squid · oracle/linux · canonical/ubuntu linux
- Source
- cve@mitre.org
EPSS 23.1% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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.debian.org/security/2016/dsa-3625
- http://www.openwall.com/lists/oss-security/2016/05/06/3Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/05/06/5Release Notes, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
- http://www.securitytracker.com/id/1035770Third Party Advisory
- http://www.squid-cache.org/Advisories/SQUID-2016_9.txtVendor Advisory
- http://www.squid-cache.org/Versions/v3/3.4/changesets/SQUID-2016_9.patch
- http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_9.patchPatch
- http://www.ubuntu.com/usn/USN-2995-1Third Party Advisory
- https://access.redhat.com/errata/RHSA-2016:1138
- https://access.redhat.com/errata/RHSA-2016:1139
- https://access.redhat.com/errata/RHSA-2016:1140
- 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.debian.org/security/2016/dsa-3625
- http://www.openwall.com/lists/oss-security/2016/05/06/3Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/05/06/5Release Notes, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
- http://www.securitytracker.com/id/1035770Third Party Advisory
- http://www.squid-cache.org/Advisories/SQUID-2016_9.txtVendor Advisory
- http://www.squid-cache.org/Versions/v3/3.4/changesets/SQUID-2016_9.patch
- http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_9.patchPatch
- http://www.ubuntu.com/usn/USN-2995-1Third Party Advisory
- https://access.redhat.com/errata/RHSA-2016:1138
- https://access.redhat.com/errata/RHSA-2016:1139
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.