UpHeron
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Servers and applications

CVE-2013-6422

The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPEER), also disables the CURLOPT_SSL_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks.

Severity
Medium 4.0
Published
23 Dec 2013
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
curlServers and applications · cpe:a:haxx:libcurl
  • Version 7.33.0
  • Version 7.32.0
  • Version 7.31.0
  • Version 7.30.0
All 18 release lines
  • Version 7.21.4
  • Version 7.21.5
  • Version 7.21.6
  • Version 7.21.7
  • Version 7.22.0
  • Version 7.23.0
  • Version 7.23.1
  • Version 7.24.0
  • Version 7.25.0
  • Version 7.26.0
  • Version 7.27.0
  • Version 7.28.0
  • Version 7.28.1
  • Version 7.29.0
  • Version 7.30.0
  • Version 7.31.0
  • Version 7.32.0
  • Version 7.33.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2013-6422
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2013-6422