High severity7.5NVD Advisory· Published Feb 9, 2018· Updated Jun 17, 2026
CVE-2018-1000027
CVE-2018-1000027
Description
The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
16cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*+ 2 more
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
- osv-coords8 versionspkg:rpm/opensuse/squid&distro=openSUSE%20Tumbleweedpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20Raspberry%20Pi%2012%20SP2pkg: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%20SP3pkg:rpm/suse/squid3&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4pkg:rpm/suse/squid3&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4
< 4.16-1.5+ 7 more
- (no CPE)range: < 4.16-1.5
- (no CPE)range: < 3.5.21-26.6.1
- (no CPE)range: < 3.5.21-26.6.1
- (no CPE)range: < 3.5.21-26.6.1
- (no CPE)range: < 3.5.21-26.6.1
- (no CPE)range: < 3.5.21-26.6.1
- (no CPE)range: < 3.1.23-8.16.37.3.1
- (no CPE)range: < 3.1.23-8.16.37.3.1
Patches
Vulnerability mechanics
References
9- www.squid-cache.org/Advisories/SQUID-2018_2.txtnvdPatchVendor Advisory
- www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patchnvdPatchVendor Advisory
- www.squid-cache.org/Versions/v4/changesets/SQUID-2018_2.patchnvdPatchVendor Advisory
- github.com/squid-cache/squid/pull/129/filesnvdThird Party Advisory
- lists.debian.org/debian-lts-announce/2018/02/msg00001.htmlnvdMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2018/02/msg00002.htmlnvdMailing ListThird Party Advisory
- usn.ubuntu.com/3557-1/nvdThird Party Advisory
- www.debian.org/security/2018/dsa-4122nvdThird Party Advisory
- usn.ubuntu.com/4059-2/nvd
News mentions
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