CVE-2013-4238

MediumCVSS 4.3/10Last modified Jun 16, 2026

Description

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.

Metrics

CVSS 2.0 4.3/10AV:N/AC:M/Au:N/C:N/I:P/A:N

Weakness enumeration

CWE-20

Affected software

No affected versions have been published.

Timeline

Published: Aug 18, 2013
Last modified: Jun 16, 2026
NVD status: Modified

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