UpHeron
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Servers and applications

CVE-2018-1000027

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…

Severity
High 7.5
Published
9 Feb 2018
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.0.23
Exploit chance
13% in the next 30 daysHigher than 96% of CVEs. EPSS by FIRST, 11 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • Every version before 4.0.23

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-1000027
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-1000027