CVE-2011-3872
Puppet 2.6.x before 2.6.12 and 2.7.x before 2.7.6, and Puppet Enterprise (PE) Users 1.0, 1.1, and 1.2 before 1.2.4, when signing an agent certificate, adds the Puppet master's certdnsnames values to the X.509 Subject Alternative Name field of the…
Does this matter?
Lower severity and a low EPSS score (2.52%). Track it; it rarely justifies an emergency change on its own.
Description
Puppet 2.6.x before 2.6.12 and 2.7.x before 2.7.6, and Puppet Enterprise (PE) Users 1.0, 1.1, and 1.2 before 1.2.4, when signing an agent certificate, adds the Puppet master's certdnsnames values to the X.509 Subject Alternative Name field of the certificate, which allows remote attackers to spoof a Puppet master via a man-in-the-middle (MITM) attack against an agent that uses an alternate DNS name for the master, aka "AltNames Vulnerability."
- CVSS 2.0
- 2.6 LOWAV:N/AC:H/Au:N/C:N/I:P/A:N
- EPSS
- 2.52% probability · 85th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- puppet/puppet · puppetlabs/puppet · puppet/puppet enterprise · puppetlabs/puppet enterprise users
- Source
- cve@mitre.org
EPSS 2.5% 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://groups.google.com/group/puppet-announce/browse_thread/thread/e7edc3a71348f3e1Patch
- http://puppetlabs.com/blog/important-security-announcement-altnames-vulnerability/
- http://secunia.com/advisories/46550Vendor Advisory
- http://secunia.com/advisories/46578Vendor Advisory
- http://secunia.com/advisories/46934
- http://secunia.com/advisories/46964
- http://www.securityfocus.com/bid/50356
- http://www.ubuntu.com/usn/USN-1238-1
- http://www.ubuntu.com/usn/USN-1238-2
- https://exchange.xforce.ibmcloud.com/vulnerabilities/70970
- https://puppet.com/security/cve/cve-2011-3872
- http://groups.google.com/group/puppet-announce/browse_thread/thread/e7edc3a71348f3e1Patch
- http://puppetlabs.com/blog/important-security-announcement-altnames-vulnerability/
- http://secunia.com/advisories/46550Vendor Advisory
- http://secunia.com/advisories/46578Vendor Advisory
- http://secunia.com/advisories/46934
- http://secunia.com/advisories/46964
- http://www.securityfocus.com/bid/50356
- http://www.ubuntu.com/usn/USN-1238-1
- http://www.ubuntu.com/usn/USN-1238-2
- https://exchange.xforce.ibmcloud.com/vulnerabilities/70970
- https://puppet.com/security/cve/cve-2011-3872
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.