HOMEVULNERABILITIESCVE-2021-27023
CRITICAL

CVE-2021-27023

NVD-CWE-noinfoPublished: November 18, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A flaw was discovered in Puppet Agent and Puppet Server that may result in a leak of HTTP credentials when following HTTP redirects to a different host. This is similar to CVE-2018-1000007

NVD Source

Technical Analysis

CVE-2021-27023 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
puppet3 product(s)
puppet agentpuppet enterprisepuppet server
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://puppet.com/security/cve/CVE-2021-27023
ADVISORYhttps://puppet.com/security/cve/CVE-2021-27023

All References (4)

→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62SELE7EKVKZL4GABFMVYMIIUZ7FPEF7/
→
https://puppet.com/security/cve/CVE-2021-27023Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62SELE7EKVKZL4GABFMVYMIIUZ7FPEF7/
→
https://puppet.com/security/cve/CVE-2021-27023Vendor Advisory

Quick Facts

CVE IDCVE-2021-27023
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected2 vendor(s)
PublishedNov 18, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2008-4619
10.0
CVE-2012-1002
10.0
CVE-2017-6326
10.0
CVE-2009-1443
10.0
CVE-2012-3859
10.0
CVE-2012-1774
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-27023 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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