CVE-2021-27023

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

Published: 2021-11-18 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-27023 is rated Moderate Risk (60.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.41%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-27023

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-10-28 0.26% 0.41% +0.15%
2 2025-04-27 0.24% 0.26% +0.02%
3 2025-03-30 — 0.24% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27023

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-27023

GitHub Security Advisory for CVE-2021-27023

GHSA-93j5-g845-9wqp · Severity: medium · Ecosystem: rubygems — Unsafe HTTP Redirect in Puppet Agent and Puppet Server

OS Trackers for CVE-2021-27023

vendor priority summary link
debian unimportant CVE-2021-27023 unimportant priority: Debian including 3 source packages (puppet, puppet-agent, puppetserver), 7 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 6, open 1. https://security-tracker.debian.org/tracker/CVE-2021-27023
redhat high — https://access.redhat.com/security/cve/CVE-2021-27023
suse high — https://www.suse.com/security/cve/CVE-2021-27023/
ubuntu medium CVE-2021-27023 medium priority: Ubuntu including 1 source packages (puppet), 15 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 6, needs-triage 5, ignored 3, released 1. https://ubuntu.com/security/CVE-2021-27023

Affected software / configurations for CVE-2021-27023

Vendor Product Version Raw CPE
puppet puppet_agent < 6.25.1 cpe:2.3:a:puppet:puppet_agent:*:*:*:*:*:*:*:*
puppet puppet_agent >= 7.0.0, < 7.12.1 cpe:2.3:a:puppet:puppet_agent:*:*:*:*:*:*:*:*
puppet puppet_enterprise < 2019.8.9 cpe:2.3:a:puppet:puppet_enterprise:*:*:*:*:*:*:*:*
puppet puppet_enterprise >= 2021.0.0, < 2021.4 cpe:2.3:a:puppet:puppet_enterprise:*:*:*:*:*:*:*:*
puppet puppet_server < 6.17.1 cpe:2.3:a:puppet:puppet_server:*:*:*:*:*:*:*:*
puppet puppet_server >= 7.0.0, < 7.4.2 cpe:2.3:a:puppet:puppet_server:*:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

References for CVE-2021-27023

cvelogic Threat Intelligence