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Servers and applications

CVE-2020-14058

SQUID-2020:6 Denial of Service issue in TLS handshake

Severity
High 7.5
Published
19 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.12, 5.0.3
Also known as
GHSA-qvf6-485q-vm57
Sources
NVD, Project advisories (GitHub)

Description

An issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to use of a potentially dangerous function, Squid and the default certificate validation helper are vulnerable to a Denial of Service when opening a TLS connection to an attacker-controlled server for HTTPS. This occurs because unrecognized error values are mapped to NULL, but later code expects that each error value is…

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • 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
  • From 5.0.1 before 5.0.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2020-14058
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2020-14058
  • GitHub Advisory Database https://github.com/advisories/GHSA-qvf6-485q-vm57
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-qvf6-485q-vm57