CVE-2023-1894Network attack vector

Service slowdown via certificate-name validation regex

Published May 4, 2023 · Updated Jan 29, 2025

ReDoS in Puppet Server 7.9.2 and affected Puppet Enterprise releases allows remote attackers to significantly slow server operations. Certificate-name validation applies an inefficient regular expression to specifically crafted names, causing excessive processing as input complexity grows. No authentication or user interaction is required, and the documented consequence is degraded availability rather than data access or modification.

CVSS severity5.3
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in Puppet Server 7.9.2 and affected Puppet Enterprise releases allows remote attackers to significantly slow server operations. Certificate-name validation applies an inefficient regular expression to specifically crafted names, causing excessive processing as input complexity grows. No authentication or user interaction is required, and the documented consequence is degraded availability rather than data access or modification.

The record

CVE
CVE-2023-1894
Published
May 4, 2023
Updated
Jan 29, 2025
Vendor
BlazeMeter
Product
Puppet Enterprise
Classifications
CWE-1333, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2021.7.1 <2021.7.3
  2. Affected versionversion=2023.0.0 <2023.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BlazeMeter · Puppet Enterpriseversion=2021.7.1 <2021.7.3; version=2023.0.0 <2023.1.0
BlazeMeter · Puppet Serverversion=7.9.2 <7.11.0; version=7.9.2 <8.0.0

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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