Is CVE-2011-5021 being actively exploited?

CVE-2011-5021 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2011-5021?

CVE-2011-5021 has a CVSS 2.0 base score of 7.5 (HIGH).

CVE-2011-5021

HIGH · CVSS 7.5EPSS 1.3%EU EUVD

PHPIDS before 0.7 does not properly implement Regular Expression Denial of Service (ReDoS) filters, which allows remote attackers to bypass rulesets and add PHP sequences to a file via unspecified vectors.

Key facts

CVSS score: 7.5 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness (CWE): CWE-94
EPSS score: 1.3% (72th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2011-4926)
Published: December 29, 2011
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-4926 in the EU Vulnerability Database. Last updated in EUVD on September 16, 2024.

View on the EU Vulnerability Database

Affected products

phpids / phpids
phpids / phpids

References

https://sitewat.ch/Advisory/View/7(URL Repurposed)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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