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Servers and applications

CVE-2013-2099

Algorithmic complexity vulnerability in the ssl.match_hostname function in Python 3.2.x, 3.3.x, and earlier, and unspecified versions of python-backports-ssl_match_hostname as used for older Python versions, allows remote attackers to cause a denial of service (CPU consumption) via multiple wildcard characters in the common name in a certificate.

Severity
Medium 4.3
Published
9 Oct 2013
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
PythonServers and applications · cpe:a:python:python
  • Version 3.3.2
  • Version 3.3.1
  • Version 3.3.0
  • Version 3.2.5
All 9 release lines
  • Version 3.2.0
  • Version 3.2.1
  • Version 3.2.2
  • Version 3.2.3
  • Version 3.2.4
  • Version 3.2.5
  • Version 3.3.0
  • Version 3.3.1
  • Version 3.3.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2013-2099
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2013-2099