Service interruption via crafted Name regular expression
Published Apr 27, 2025 · Updated Apr 28, 2025
Inefficient regular expression complexity in Apereo CAS 5.2.6 allows remote authenticated users to interrupt service via a crafted Name value. CasConfigurationMetadataServerController evaluates the attacker-controlled Name argument as a regular expression without constraining its computational complexity. Low-privileged network access to the endpoint is required, and pathological matching consumes processing resources until availability degrades.
Summary
What happened
Inefficient regular expression complexity in Apereo CAS 5.2.6 allows remote authenticated users to interrupt service via a crafted Name value. CasConfigurationMetadataServerController evaluates the attacker-controlled Name argument as a regular expression without constraining its computational complexity. Low-privileged network access to the endpoint is required, and pathological matching consumes processing resources until availability degrades.
The record
- CVE
- CVE-2025-3986
- Published
- Apr 27, 2025
- Updated
- Apr 28, 2025
- Vendor
- Apereo
- Product
- Apereo CAS
- Classifications
- CWE-400, CWE-1333, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 27, 2025CVE publishedPublication date reported by the CVE source.
- Apr 28, 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=5.2.6
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
- Apereo CAS 5.2.6 ReDoS denial-of-service proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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