CVE Database›Document archive›CVE-2013-2099

CVE-2013-2099

python: ssl.match_hostname() DoS via certificates with specially crafted hostname wildcard patterns

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Severity

Low

Red Hat Product Security

2.6

CVSS 2.0

Review impact separately from score.

Published · May 15, 2013

Updated · June 28, 2026

Description

A denial of service flaw was found in the way Python's SSL module implementation performed matching of certain certificate names. A remote attacker able to obtain a valid certificate that contained multiple wildcard characters could use this flaw to issue a request to validate such a certificate, resulting in excessive consumption of CPU.

Statement

This issue did not affect the versions of python as shipped with Red Hat Enterprise Linux 5 and 6 as the SSL module there did not implement the match_hostname() routine yet.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 2.0 · 2.6
AV:N/AC:H/Au:N/C:N/I:N/A:P

CWE-407 · Inefficient Algorithmic Complexity