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CVE-2021-35368

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is...

9.8 CriticalFix available

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.73%Up 1.7 points since Nov 6, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Record
CVE-2021-35368
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated
2026-11-02
CVE List No score

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Record
CVE-2021-35368
Updated
2026-11-02
EUVDEUVD-2021-22011 No score

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Record
EUVD-2021-22011
Updated
2026-11-03
GitHub AdvisoriesGHSA-2xw7-44j9-24rv 9.8

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is...

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Record
GHSA-2xw7-44j9-24rv
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-863
Updated
2026-11-02
OSV 9.8

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Record
CVE-2021-35368
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-35368 9.8

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Record
DEBIAN-CVE-2021-35368
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-35368 9.8

OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname.

Record
UBUNTU-CVE-2021-35368
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVMGASA-2024-0070 No score

Updated apache-mod_security-crs packages fix security vulnerabilities

A SQL injection bypass (aka PL1 bypass) exists in OWASP ModSecurity Core Rule Set (owasp-modsecurity-crs) through v3.1.0-rc3 via {ab} where a is a special function name (such as "if") and b is the SQL statement to be executed. (CVE-2018-16384) Modsecurity owasp-modsecurity-crs 3.2.0 (Paranoia level at PL1) has a SQL injection bypass vulnerability. Attackers can use the comment characters and variable assignments in the SQL syntax to bypass Modsecurity WAF protection and implement SQL injection attacks on Web applications. (CVE-2020-22669) OWASP ModSecurity Core Rule Set 3.1.x before 3.1.2, 3.2.x before 3.2.1, and 3.3.x before 3.3.2 is affected by a Request Body Bypass via a trailing pathname. (CVE-2021-35368) The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass by submitting a specially crafted HTTP Content-Type header field that indicates multiple character encoding schemes. A vulnerable back-end can potentially be exploited by declaring multiple Content-Type "charset" names and therefore bypassing the configurable CRS Content-Type header "charset" allow list. An encoded payload can bypass CRS detection this way and may then be decoded by the backend. (CVE-2022-39955) The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass for HTTP multipart requests by submitting a payload that uses a character encoding scheme via the Content-Type or the deprecated Content-Transfer-Encoding multipart MIME header fields that will not be decoded and inspected by the web application firewall engine and the rule set. The multipart payload will therefore bypass detection. A vulnerable backend that supports these encoding schemes can potentially be exploited. (CVE-2022-39956) 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. (CVE-2022-39957) The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass to sequentially exfiltrate small and undetectable sections of data by repeatedly submitting an HTTP Range header field with a small byte range. A restricted resource, access to which would ordinarily be detected, may be exfiltrated from the backend, despite being protected by a web application firewall that uses CRS. Short subsections of a restricted resource may bypass pattern matching techniques and allow undetected access. (CVE-2022-39958)

Record
MGASA-2024-0070
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
modsecurity-crs
Debian:12
before 3.3.2-1
3.3.2-1
modsecurity-crs
Debian:13
before 3.3.2-1
3.3.2-1
modsecurity-crs
Debian:14
before 3.3.2-1
3.3.2-1
apache-mod_security-crs
Mageia:9
From an advisory covering 7 CVEs
before 3.3.5-1.mga9
3.3.5-1.mga9
modsecurity-crs
Ubuntu:16.04:LTS
All versions, plus listed versions
2.2.9-1
None known
modsecurity-crs
Ubuntu:18.04:LTS
All versions, plus listed versions
3.0.0-33.0.2-1
None known
modsecurity-crs
Ubuntu:20.04:LTS
All versions, plus listed versions
3.1.1-13.2.0-1
None known
modsecurity-crs
Ubuntu:22.04:LTS
All versions, plus listed versions
3.3.0-13.3.2-1
None known
modsecurity-crs
Ubuntu:24.04:LTS
All versions, plus listed versions
3.3.5-13.3.5-2
None known
modsecurity-crs
Ubuntu:25.10
All versions, plus listed versions
3.3.7-1
None known
modsecurity-crs
Ubuntu:26.10
All versions, plus listed versions
3.3.8-13.3.9-1
None known
modsecurity-crs
Ubuntu:26.04:LTS
All versions, plus listed versions
3.3.7-13.3.8-1
None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-35368 is a critical vulnerability (CVSS 9.8) in Owasp Modsecurity Core Rule Set, published November 5, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.73%, the 86th percentile. Fixed in modsecurity-crs 3.3.2-1.

References

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