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 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."
Key facts
- CVSS score
- 2.6 (v2.0)
- Severity
- LOW
- CVSS vector
AV:N/AC:H/Au:N/C:N/I:P/A:N- Weakness (CWE)
- CWE-20
- EPSS score
- 2.5% (85th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-3826)
- Published
- October 27, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-3826 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet
- puppet / puppet enterprise
- puppet / puppet enterprise
- puppet / puppet enterprise
- puppet / puppet enterprise
- puppetlabs / puppet
- puppetlabs / puppet
- puppetlabs / puppet enterprise users
- puppetlabs / puppet enterprise users
References
- http://groups.google.com/group/puppet-announce/browse_thread/thread/e7edc3a71348f3e1(Patch)
- http://puppetlabs.com/blog/important-security-announcement-altnames-vulnerability/
- http://secunia.com/advisories/46550(Vendor Advisory)
- http://secunia.com/advisories/46578(Vendor 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
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
Query CVEs from your AI assistant
The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.
Add the CVE brain