CVE-2025-3985Public exploitNetwork attack vector

Authenticated service interruption via compiled search regex

Published Apr 27, 2025 · Updated Apr 28, 2025

ReDoS in the management webapp of Apereo CAS 5.2.6 allows remote authenticated users to interrupt service through a crafted search query. The search method inserts the raw query between ^.* and .*$, compiles it with RegexUtils, and matches it against every service ID, name, and description. Access to the management webapp search endpoint is required, and a pathological expression consumes CPU while the registry is scanned.

CVSS severity4.9
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in the management webapp of Apereo CAS 5.2.6 allows remote authenticated users to interrupt service through a crafted search query. The search method inserts the raw query between ^.* and .*$, compiles it with RegexUtils, and matches it against every service ID, name, and description. Access to the management webapp search endpoint is required, and a pathological expression consumes CPU while the registry is scanned.

The record

CVE
CVE-2025-3985
Published
Apr 27, 2025
Updated
Apr 28, 2025
Vendor
Apereo
Product
Apereo CAS
Classifications
CWE-1333, CWE-400, T1499.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 27, 2025CVE publishedPublication date reported by the CVE source.
  2. 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.

  1. Affected versionversion=5.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Apereo · Apereo CASversion=5.2.6

Published CVSS scores

5.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
2.7VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
3.3VulDBAV:N/AC:L/Au:M/C:N/I:N/A:P

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

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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