pyOpenSSL: hostname check bypassing vulnerability
Published Sep 30, 2013
8.7
HIGHCVSS 4.0
EPSS 1.20%
Description
The X509Extension in pyOpenSSL before 0.13.1 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.
Affected products
No data.
Configuration 1
- ≤ 0.13
- 0.7
- 0.8
- 0.9
- 0.10
- 0.11
- 0.11
- 0.11
- 0.12
Configuration 2
- 10.04
- 12.04
- 12.10
- 13.04
No data.
Red Hat Enterprise Linux 5
pyOpenSSL
Not affected
Red Hat Enterprise Linux 6
pyOpenSSL
Not affected
Red Hat Enterprise Linux 7
pyOpenSSL
Not affected
Red Hat OpenStack Platform 4
pyOpenSSL
Not affected
Red Hat Storage 2
pyOpenSSL
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | pyOpenSSL | Not affected | n/a |
| Red Hat Enterprise Linux 6 | pyOpenSSL | Not affected | n/a |
| Red Hat Enterprise Linux 7 | pyOpenSSL | Not affected | n/a |
| Red Hat OpenStack Platform 4 | pyOpenSSL | Not affected | n/a |
| Red Hat Storage 2 | pyOpenSSL | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of pyOpenSSL as shipped with Red Hat Enterprise Linux 5 and 6.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.20% (0.01197) | 67.06th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.20% (0.01197) | 63.98th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.25% (0.00250) | 46.30th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.15% (0.00154) | 53.10th | v3 (v2023.03.01) |
| Oct 17, 2023 | 0.15% (0.00154) | 51.57th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.15% (0.00152) | 49.54th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
References (12)
- http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html vendor-advisoryx_refsource_SUSE
- http://www.debian.org/security/2013/dsa-2763 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2013/09/06/2 mailing-listx_refsource_MLIST
- http://www.ubuntu.com/usn/USN-1965-1 vendor-advisoryx_refsource_UBUNTUVendor Advisory
- https://access.redhat.com/security/cve/CVE-2013-4314 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1005325 x_refsource_CONFIRMIssue Tracking
- https://github.com/advisories/GHSA-6748-36qp-fx6r Advisory
- https://github.com/pyca/pyopenssl/commit/6bbf44a00b35fb28df1f66aa194b2fe95eab1ab2
- https://github.com/pypa/advisory-database/tree/main/vulns/pyopenssl/PYSEC-2013-31.yaml
- https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2013-4314
- https://www.cve.org/CVERecord?id=CVE-2013-4314
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html | vendor-advisoryx_refsource_SUSE | |
| http://www.debian.org/security/2013/dsa-2763 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.openwall.com/lists/oss-security/2013/09/06/2 | mailing-listx_refsource_MLIST | |
| http://www.ubuntu.com/usn/USN-1965-1 | vendor-advisoryx_refsource_UBUNTUVendor Advisory | |
| https://access.redhat.com/security/cve/CVE-2013-4314 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1005325 | x_refsource_CONFIRMIssue Tracking | |
| https://github.com/advisories/GHSA-6748-36qp-fx6r | Advisory | |
| https://github.com/pyca/pyopenssl/commit/6bbf44a00b35fb28df1f66aa194b2fe95eab1ab2 | ||
| https://github.com/pypa/advisory-database/tree/main/vulns/pyopenssl/PYSEC-2013-31.yaml | ||
| https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2013-4314 | ||
| https://www.cve.org/CVERecord?id=CVE-2013-4314 |
Change history (0)
No recorded changes yet.