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CVE-2016-2572

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure...

7.5 HighFix available

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

10.2%Up 8.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Record
CVE-2016-2572
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Record
CVE-2016-2572
Updated
2026-11-02
EUVDEUVD-2016-3646 No score

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Record
EUVD-2016-3646
Updated
2026-11-03
GitHub AdvisoriesGHSA-6789-43mm-jrhx 7.5

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure...

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Record
GHSA-6789-43mm-jrhx
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02
OSV 7.5

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Record
CVE-2016-2572
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2016-2572 7.5

http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Record
UBUNTU-CVE-2016-2572
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVSUSE-SU-2016:2008-1 No score

Security update for squid

The Squid HTTP proxy has been updated to version 3.3.14, fixing the following security issues:

  • Fixed multiple Denial of Service issues in HTTP Response processing. (CVE-2016-2569, CVE-2016-2570, CVE-2016-2571, CVE-2016-2572, bsc#968392, bsc#968393, bsc#968394, bsc#968395)
  • CVE-2016-3947: Buffer overrun issue in pinger ICMPv6 processing. (bsc#973782)
  • CVE-2015-5400: Improper protection of alternate path. (bsc#938715)
  • CVE-2015-3455: Squid http proxy configured with client-first SSL bumping did not correctly validate server certificate. (bsc#929493)
  • CVE-2016-3948: Fixed denial of service in HTTP Response processing (bsc#973783)
  • CVE-2016-4051: fixes buffer overflow in cachemgr.cgi (bsc#976553)
  • CVE-2016-4052, CVE-2016-4053, CVE-2016-4054: Fixed multiple issues in ESI processing (bsc#976556)
  • CVE-2016-4553: Fixed cache poisoning issue in HTTP Request handling (bsc#979009)
  • CVE-2016-4554: Fixed header smuggling issue in HTTP Request processing (bsc#979010)
  • Fixed multiple Denial of Service issues in ESI Response processing. (CVE-2016-4555, CVE-2016-4556, bsc#979011, bsc#979008)

Additionally, the following non-security issues have been fixed:

  • Fix header size in script unsquid.pl. (bsc#902197)
  • Add external helper ext_session_acl to package. (bsc#959290)
  • Update forward_max_tries to permit 25 server paths With cloud sites becoming more popular more CDN servers are producing long lists of IPv6 and IPv4 addresses. If there are not enough paths selected the IPv4 ones may never be reached.
  • squid.init: wait that squid really dies when we kill it on upgrade instead of proclaiming its demise prematurely (bnc#963539)
Record
SUSE-SU-2016:2008-1
Updated
2026-11-02
OSVSUSE-SU-2016:2089-1 No score

Security update for squid3

This update for squid3 fixes the following issues:

  • Multiple issues in pinger ICMP processing. (CVE-2014-7141, CVE-2014-7142)

  • CVE-2016-3947: Buffer overrun issue in pinger ICMPv6 processing. (bsc#973782)

  • CVE-2016-4554: fix header smuggling issue in HTTP Request processing (bsc#979010)

  • Fix multiple Denial of Service issues in HTTP Response processing. (CVE-2016-2569, CVE-2016-2570, CVE-2016-2571, CVE-2016-2572, bsc#968392, bsc#968393, bsc#968394, bsc#968395)

  • Regression caused by the DoS fixes above (bsc#993299)

  • CVE-2016-3948: Fix denial of service in HTTP Response processing (bsc#973783)

  • CVE-2016-4051: fixes buffer overflow in cachemgr.cgi (bsc#976553)

  • CVE-2016-4052, CVE-2016-4053, CVE-2016-4054:

    • fixes multiple issues in ESI processing (bsc#976556)
  • CVE-2016-4556: fixes double free vulnerability in Esi.cc (bsc#979008)

  • CVE-2015-5400: Improper Protection of Alternate Path (bsc#938715)

  • CVE-2014-6270: fix off-by-one in snmp subsystem (bsc#895773)

  • Memory leak in squid3 when using external_acl (bsc#976708)

Record
SUSE-SU-2016:2089-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
squid-debuginfo
Red Hat:enterprise_linux:7::server
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid-sysvinit
Red Hat:enterprise_linux:7::server
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid
Red Hat:enterprise_linux:7::server
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid-migration-script
Red Hat:enterprise_linux:7::server
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid-debuginfo
Red Hat:enterprise_linux:7::workstation
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid-sysvinit
Red Hat:enterprise_linux:7::workstation
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid
Red Hat:enterprise_linux:7::workstation
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid-migration-script
Red Hat:enterprise_linux:7::workstation
before 7:3.5.20-2.el7
7:3.5.20-2.el7
squid
SUSE:Linux Enterprise Server 12 SP1
before 3.3.14-20.2
3.3.14-20.2
squid
SUSE:Linux Enterprise Server for SAP Applications 12 SP1
before 3.3.14-20.2
3.3.14-20.2
squid3
SUSE:Linux Enterprise Server 11 SP4
before 3.1.23-8.16.30.1
3.1.23-8.16.30.1
squid3
SUSE:Linux Enterprise Server for SAP Applications 11 SP4
before 3.1.23-8.16.30.1
3.1.23-8.16.30.1

History

History
RecordedChangedSources
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-2572 is a high vulnerability (CVSS 7.5) in Squid-cache Squid, published February 27, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 10.2%, the 95th percentile. Fixed in squid-debuginfo 7:3.5.20-2.el7.

References

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