CVE-2016-2569
Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not properly append data to String objects, which allows remote servers to cause a denial of service (assertion failure and daemon exit) via a long string, as demonstrated by a crafted HTTP Vary header.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 31.2%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not properly append data to String objects, which allows remote servers to cause a denial of service (assertion failure and daemon exit) via a long string, as demonstrated by a crafted HTTP Vary header.
- 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
- 31.19% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- squid-cache/squid
- Source
- cve@mitre.org
EPSS moved from 35.4% on 21 September 2026 to 31.2% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
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://rhn.redhat.com/errata/RHSA-2016-2600.html
- http://www.openwall.com/lists/oss-security/2016/02/26/2
- http://www.securitytracker.com/id/1035101
- http://www.squid-cache.org/Advisories/SQUID-2016_2.txtVendor Advisory
- http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13991.patch
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-14552.patch
- https://security.gentoo.org/glsa/201607-01
- https://usn.ubuntu.com/3557-1/
- 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://rhn.redhat.com/errata/RHSA-2016-2600.html
- http://www.openwall.com/lists/oss-security/2016/02/26/2
- http://www.securitytracker.com/id/1035101
- http://www.squid-cache.org/Advisories/SQUID-2016_2.txtVendor Advisory
- http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13991.patch
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-14552.patch
- https://security.gentoo.org/glsa/201607-01
- https://usn.ubuntu.com/3557-1/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.