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 ce
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."
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Oct 27, 2011
- Updated
- Jun 16, 2026
- EPSS
- 2.5% · 84th percentile
- CWE
- CWE-20
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Report tools
Action score
11
Monitor
Low priority for now.
- CVSS
- 10 / 40 · 2.6 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| puppet | puppet | cpe:2.3:a:puppet:puppet |
| puppet | puppet enterprise | cpe:2.3:a:puppet:puppet_enterprise |
| puppetlabs | puppet | cpe:2.3:a:puppetlabs:puppet |
| puppetlabs | puppet enterprise users | cpe:2.3:a:puppetlabs:puppet_enterprise_users |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- puppet puppet2.6.0
- puppet puppet2.6.1
- puppet puppet2.6.10
- puppet puppet2.6.11
- puppet puppet2.6.2
- puppet puppet2.6.3
- puppet puppet2.6.4
- puppet puppet2.6.5
- puppet puppet2.6.6
- puppet puppet2.6.7
- puppet puppet2.6.8
- puppet puppet2.6.9
- puppet puppet2.7.2
- puppet puppet2.7.3
- puppet puppet2.7.4
- puppet puppet2.7.5
- puppet puppet enterprise1.2.0
- puppet puppet enterprise1.2.1
- puppet puppet enterprise1.2.2
- puppet puppet enterprise1.2.3
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:11 | puppet | before 2.7.6-1 | 2.7.6-1 |
| Debian:5.0 | puppet | before 0.24.5-3+lenny2 | 0.24.5-3+lenny2 |
| Debian:6.0 | puppet | before 2.6.2-5+squeeze3 | 2.6.2-5+squeeze3 |
Same product
puppet: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-2785Puppet Server before 2.3.2 and Ruby puppetmaster in Puppet 4.x before 4.4.2 and in Puppet Agent before 1.4.2 might allow remote attackers to40Plan
- CVE-2013-1640The (1) template and (2) inline_template functions in the master server in Puppet before 2.6.18, 2.7.x before 2.7.21, and 3.1.x before 3.1.137Monitor
- CVE-2021-27021A flaw was discovered in Puppet DB, this flaw results in an escalation of privileges which allows the user to delete tables via an SQL query35Monitor
- CVE-2018-6513Puppet Enterprise 2016.4.x prior to 2016.4.12, Puppet Enterprise 2017.3.x prior to 2017.3.7, Puppet Enterprise 2018.1.x prior to 2018.1.1, P35Monitor
- CVE-2017-2295Versions of Puppet prior to 4.10.1 will deserialize data off the wire (from the agent to the server, in this case) with a attacker-specified33Monitor
- CVE-2018-6515Puppet Agent 1.10.x prior to 1.10.13, Puppet Agent 5.3.x prior to 5.3.7, and Puppet Agent 5.5.x prior to 5.5.2 on Windows only, with a speci31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:puppet | 2.7.6-1 · Debian:11 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:5 | 2011-10-17 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-11 d
- Published
- TodaySep 30, 2026+5452 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- P · data or configuration can be modified
- Availability
- none
- Attack complexity
- High
- Confidentiality impact
- None
- Integrity impact
- P
- Availability impact
- None
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
AV:N/AC:H/Au:N/C:N/I:P/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- groups.google.com/group/puppet-announce/browse_thread/thread/e7edc3a71348f3e1
- puppetlabs.com/blog/important-security-announcement-altnames-vulnerability/
- secunia.com/advisories/46550
- secunia.com/advisories/46578
- secunia.com/advisories/46934
- secunia.com/advisories/46964
- www.securityfocus.com/bid/50356
- www.ubuntu.com/usn/USN-1238-1
- www.ubuntu.com/usn/USN-1238-2
- exchange.xforce.ibmcloud.com/vulnerabilities/70970
- puppet.com/security/cve/cve-2011-3872
Vendor advisories and official records. Exploit/PoC links are deliberately left out.