CVE-2013-4073
The OpenSSL::SSL.verify_certificate_identity function in lib/openssl/ssl.rb in Ruby 1.8 before 1.8.7-p374, 1.9 before 1.9.3-p448, and 2.0 before 2.0.0-p247 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field…
Does this matter?
Lower severity and a low EPSS score (2.76%). Track it; it rarely justifies an emergency change on its own.
Description
The OpenSSL::SSL.verify_certificate_identity function in lib/openssl/ssl.rb in Ruby 1.8 before 1.8.7-p374, 1.9 before 1.9.3-p448, and 2.0 before 2.0.0-p247 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.
- CVSS 2.0
- 6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
- EPSS
- 2.76% probability · 86th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-310
- Affected
- ruby-lang/ruby
- Source
- cve@mitre.org
EPSS 2.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
- http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html
- http://lists.opensuse.org/opensuse-updates/2013-07/msg00042.html
- http://lists.opensuse.org/opensuse-updates/2013-07/msg00044.html
- http://rhn.redhat.com/errata/RHSA-2013-1090.html
- http://rhn.redhat.com/errata/RHSA-2013-1103.html
- http://rhn.redhat.com/errata/RHSA-2013-1137.html
- http://support.apple.com/kb/HT6150
- http://www.debian.org/security/2013/dsa-2738
- http://www.debian.org/security/2013/dsa-2809
- http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/Vendor Advisory
- http://www.ubuntu.com/usn/USN-1902-1
- https://bugzilla.redhat.com/show_bug.cgi?id=979251
- https://puppet.com/security/cve/cve-2013-4073
- http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
- http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html
- http://lists.opensuse.org/opensuse-updates/2013-07/msg00042.html
- http://lists.opensuse.org/opensuse-updates/2013-07/msg00044.html
- http://rhn.redhat.com/errata/RHSA-2013-1090.html
- http://rhn.redhat.com/errata/RHSA-2013-1103.html
- http://rhn.redhat.com/errata/RHSA-2013-1137.html
- http://support.apple.com/kb/HT6150
- http://www.debian.org/security/2013/dsa-2738
- http://www.debian.org/security/2013/dsa-2809
- http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/Vendor Advisory
- http://www.ubuntu.com/usn/USN-1902-1
- https://bugzilla.redhat.com/show_bug.cgi?id=979251
- https://puppet.com/security/cve/cve-2013-4073
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.