CVE-2013-4238

no score yetEPSS 5.3%

No CVSS score yet. EPSS 5.3% chance of exploitation in the next 30 days.

The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

EPSS: 5.3% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
CWE: CWE-20
Published: 2013-08-18
Modified: 2026-06-16
Record from: the NVD, synced 2026-10-19

Affected

canonical:ubuntu_linux
opensuse:opensuse
python:python

References

http://bugs.python.org/issue18709
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.html

Check your stack JSON