UpHeron
All vulnerabilities

Servers and applications

CVE-2019-18676

An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.

Severity
High 7.5
Published
26 Nov 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
9.2% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • From 3.0 up to 3.5.28
  • From 4.0 up to 4.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-18676
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-18676