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.
Published 2022-09-20 07:15:12
Updated 2023-05-21 22:15:14
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2022-39957

Probability of exploitation activity in the next 30 days: 0.25%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 64 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2022-39957

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.9
3.6
NIST
7.3
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.9
3.4
Switzerland Government Common Vulnerability Program

CWE ids for CVE-2022-39957

  • The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
    Assigned by: nvd@nist.gov (Primary)
  • The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
    Assigned by: vulnerability@ncsc.ch (Secondary)

References for CVE-2022-39957

Products affected by CVE-2022-39957

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