UpHeron
All vulnerabilities

Servers and applications

CVE-2020-15049

SQUID-2020:7 Cache Poisoning Issue in HTTP Request processing

Severity
High 8.8
Published
26 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.12, 5.0.3
Also known as
GHSA-qf3v-rc95-96j5
Sources
NVD, Project advisories (GitHub)

Description

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • From 5.0 before 5.0.3
  • From 4.0 before 4.12
  • From 3.1 up to 3.5.28
  • Version 2.7-stable9
All 13 release lines
  • From 2.0 up to 2.6
  • Version 2.7
  • Version 2.7-stable2
  • Version 2.7-stable3
  • Version 2.7-stable4
  • Version 2.7-stable5
  • Version 2.7-stable6
  • Version 2.7-stable7
  • Version 2.7-stable8
  • Version 2.7-stable9
  • From 3.1 up to 3.5.28
  • From 4.0 before 4.12
  • From 5.0 before 5.0.3
SquidServers and applications · github:squid-cache/squid
  • Version 2.0-2.STABLE9

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2020-15049
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2020-15049
  • GitHub Advisory Database https://github.com/advisories/GHSA-qf3v-rc95-96j5
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5