Is CVE-2022-39957 in the CISA KEV catalog?

No. CVE-2022-39957 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-39957?

CVE-2022-39957 has a CVSS v3 base score of 7.3 (HIGH).

What is the EPSS score for CVE-2022-39957?

CVE-2022-39957 has an EPSS score of 0.77% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-39957?

Upgrade modsecurity-crs on debian 11 to 3.3.4-1~deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2022-39957

HIGH

7.3

CVSS v3

NVD

Description

The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional "charset" parameter in order to receive the response in an encoded form. Depending on the "charset", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.

CWE-693Protection Mechanism Failure CWE-116

How to fix

Remediation Available

modsecurity-crsDebian

Fixed in:3.3.4-1~deb11u1CVE-2022-39957

Fixed in:3.3.4-1CVE-2022-39957

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

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Exploit Intelligence

0.77%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Patch1

coreruleset.org

Third-Party Advisory1

lists.debian.org

Other references5

Related Vulnerabilities

Other CWE-693 (Protection Mechanism Failure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-2465	Critical	9.8	99%	KEV + Ransom	-
CVE-2024-21412	High	8.1	95%	KEV + Ransom	Fix
CVE-2013-0431	Medium	5.3	90%	KEV + Ransom	-
CVE-2025-40536	High	8.1	82%	KEV	Fix
CVE-2019-1003030	Critical	9.9	76%	KEV	-
CVE-2025-0411	High	7.0	67%	KEV	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 2025-11-03.