Is CVE-2009-5031 in the CISA KEV catalog?

No. CVE-2009-5031 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-5031?

CVE-2009-5031 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2009-5031?

CVE-2009-5031 has an EPSS score of 2.93% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-5031?

Upgrade modsecurity to 2.5.11 or later.

CVE & CISA-KEV Catalog

CVE-2009-5031

MEDIUMEPSS 85th pctl

4.3

CVSS v2

NVD

Description

ModSecurity before 2.5.11 treats request parameter values containing single quotes as files, which allows remote attackers to bypass filtering rules and perform other attacks such as cross-site scripting (XSS) attacks via a single quote in a request parameter in the Content-Disposition field of a request with a multipart/form-data Content-Type header.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

modsecurityNVD

Affected:< 2.5.11Fixed in:2.5.11CVE-2009-5031derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.93%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Third-Party Advisory9

Other references2

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.