Medium severity6.5NVD Advisory· Published Sep 2, 2020· Updated Jun 17, 2026
CVE-2020-15811
CVE-2020-15811
Description
An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
41- Squid/Squiddescription
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*+ 2 more
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- osv-coords28 versionspkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/squid3&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/squid3&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP1pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/squid&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/opensuse/squid&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/squid&distro=openSUSE%20Leap%2015.1pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/squid&distro=SUSE%20Enterprise%20Storage%205pkg:rpm/opensuse/squid&distro=openSUSE%20Tumbleweedpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5
< 3.5.21-26.32.1+ 27 more
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.1.23-8.16.37.15.1
- (no CPE)range: < 3.1.23-8.16.37.15.1
- (no CPE)range: < 4.13-5.23.1
- (no CPE)range: < 4.13-4.15.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 4.13-lp152.2.6.1
- (no CPE)range: < 4.13-lp151.2.24.1
- (no CPE)range: < 4.13-5.23.1
- (no CPE)range: < 4.13-5.23.1
- (no CPE)range: < 4.13-5.23.1
- (no CPE)range: < 4.13-5.23.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 4.16-1.5
- (no CPE)range: < 3.5.21-26.32.1
- (no CPE)range: < 4.13-5.23.1
- (no CPE)range: < 4.13-4.15.1
Patches
Vulnerability mechanics
References
13- github.com/squid-cache/squid/security/advisories/GHSA-c7p8-xqhm-49wvnvdPatch
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.htmlnvdMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.htmlnvdMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/10/msg00005.htmlnvdMailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2/nvdMailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMTFLVB7GLRF2CKGFPZ4G4R5DIIPHWI3/nvdMailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HJJDI7JQFGQLVNCKMVY64LAFMKERAOK7/nvdMailing ListThird Party Advisory
- security.netapp.com/advisory/ntap-20210219-0007/nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20210226-0006/nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20210226-0007/nvdBroken LinkThird Party Advisory
- usn.ubuntu.com/4477-1/nvdThird Party Advisory
- usn.ubuntu.com/4551-1/nvdThird Party Advisory
- www.debian.org/security/2020/dsa-4751nvdMailing ListThird Party Advisory
News mentions
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