CVE-2013-2099
MEDIUM · CVSS 4.3EPSS 4.9%EU EUVD
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.
Key facts
- CVSS score
- 4.3 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:P- Weakness (CWE)
- CWE-399
- EPSS score
- 4.9% (92th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2013-2072)
- Published
- October 9, 2013
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2013-2072 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- python / python
- python / python
- python / python
- python / python
- python / python
- python / python
- python / python
- python / python
- python / python
References
- http://bugs.python.org/issue17980(Patch)
- http://rhn.redhat.com/errata/RHSA-2014-1690.html
- http://secunia.com/advisories/55107(Vendor Advisory)
- http://secunia.com/advisories/55116(Vendor Advisory)
- http://www.openwall.com/lists/oss-security/2013/05/16/6
- http://www.ubuntu.com/usn/USN-1983-1
- http://www.ubuntu.com/usn/USN-1984-1
- http://www.ubuntu.com/usn/USN-1985-1
- https://access.redhat.com/errata/RHSA-2016:1166
- https://bugzilla.redhat.com/show_bug.cgi?id=963260
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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