CVE-2013-4238
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,
02 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,
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 5.34% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 92.4% of scored records. A rank, not a probability.
- NVD base score
- The NVD has published no score for this record
- NVD CVSS vector
- No NVD score to derive
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-16.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2013-08-18 01:00Z13 YR AGO
- Last updated
- 2024-08-06 16:38Z2 YR AGO
- Reserved
- 2013-06-12
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-20Improper Input ValidationClass
- Data version
- 5.1
- Document digest
- 75b40de91073817b3d3402f05648a31ffe3a5103ddb5f20201d26a8f7210cbdc
05 Affected products
06 References
- rhn.redhat.comRHSA-2013:1582http://rhn.redhat.com/errata/RHSA-2013-1582.html
- www.vmware.comhttp://www.vmware.com/security/advisories/VMSA-2014-0012.html
- lists.opensuse.orgopenSUSE-SU-2013:1463http://lists.opensuse.org/opensuse-updates/2013-09/msg00043.html
- lists.opensuse.orgopenSUSE-SU-2013:1440http://lists.opensuse.org/opensuse-updates/2013-09/msg00029.html
- www.securityfocus.com20141205 NEW: VMSA-2014-0012 - VMware vSphere product updates address security vulnerabilitieshttp://www.securityfocus.com/archive/1/534161/100/0/threaded
- www.debian.orgDSA-2880http://www.debian.org/security/2014/dsa-2880
- www.ubuntu.comUSN-1982-1http://www.ubuntu.com/usn/USN-1982-1
- lists.opensuse.orgopenSUSE-SU-2013:1437http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.html
- seclists.org20141205 NEW: VMSA-2014-0012 - VMware vSphere product updates address security vulnerabilitieshttp://seclists.org/fulldisclosure/2014/Dec/23
- lists.opensuse.orgopenSUSE-SU-2013:1462http://lists.opensuse.org/opensuse-updates/2013-09/msg00042.html
- lists.opensuse.orgopenSUSE-SU-2013:1438http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.html
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=996381
- bugs.python.orghttp://bugs.python.org/issue18709
- lists.opensuse.orgopenSUSE-SU-2013:1439http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.html
- lists.opensuse.orgopenSUSE-SU-2020:0086http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
07 Fixed in
Debian 11
- python2.7 Fixed in 2.7.5-8
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.