Service interruption via backtracking argument splitter
Published Jun 9, 2025 · Updated Jun 9, 2025
Regular expression denial of service in Unitech PM2 before 7.0.0 allows remote authenticated users to interrupt service via crafted arguments. Config._valid splits string-valued array arguments with a backtracking-prone expression that consumes excessive CPU on long repeated text followed by a delimiter. Exploitation requires influence over PM2 configuration arguments and affects availability without reported data access or modification.
Summary
What happened
Regular expression denial of service in Unitech PM2 before 7.0.0 allows remote authenticated users to interrupt service via crafted arguments. Config._valid splits string-valued array arguments with a backtracking-prone expression that consumes excessive CPU on long repeated text followed by a delimiter. Exploitation requires influence over PM2 configuration arguments and affects availability without reported data access or modification.
The record
- CVE
- CVE-2025-5891
- Published
- Jun 9, 2025
- Updated
- Jun 9, 2025
- Vendor
- Unitech
- Product
- PM2
- Classifications
- CWE-1333, CWE-400, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 9, 2025CVE publishedPublication date reported by the CVE source.
- Jun 9, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.0.0
- Affected versionversion=6.0.1
- Affected versionversion=6.0.2
- Affected versionversion=6.0.3
- Affected versionversion=6.0.4
- Affected versionversion=6.0.5
- Affected versionversion=6.0.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Config._valid ReDoS proof of conceptproof of concept · demonstrated
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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