CVE-2021-35368

Exp

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.

Published: 2021-11-05 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-35368 is rated High Exploit Risk (85.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.54%). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.24% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-35368

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-35368

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.31% 2.54% +2.24%
2 2026-06-06 0.44% 0.31% -0.13%
3 2026-05-23 — 0.44% —

Full EPSS history (31 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-35368

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-35368

OS Trackers for CVE-2021-35368

vendor priority summary link
debian not yet assigned CVE-2021-35368 not yet assigned priority: Debian including 1 source packages (modsecurity-crs), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-35368
gentoo low CVE-2021-35368: 1 GLSA(s) (202305-25), 1 atom(s) (www-apache/modsecurity-crs); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-35368
ubuntu medium CVE-2021-35368 medium priority: Ubuntu including 1 source packages (modsecurity-crs), 15 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 7, needs-triage 7, DNE 1. https://ubuntu.com/security/CVE-2021-35368

Affected software / configurations for CVE-2021-35368

Vendor Product Version Raw CPE
owasp owasp_modsecurity_core_rule_set >= 3.1.0, < 3.1.2 cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*
owasp owasp_modsecurity_core_rule_set >= 3.2.0, < 3.2.1 cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*
owasp owasp_modsecurity_core_rule_set >= 3.3.0, < 3.3.2 cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*
fedoraproject fedora 36 cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
fedoraproject fedora 37 cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2021-35368

URL Tags
https://coreruleset.org/20210630/cve-2021-35368-crs-request-body-bypass/ Exploit Release Notes Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/01/msg00033.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MS5GMNYHFFIBWLJW7N3XAD24SLF3PFZ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IVYUJOKHDEXFTM2CZMEESJ6TZSPVNSSZ/
https://owasp.org/www-project-modsecurity-core-rule-set/ Vendor Advisory
https://portswigger.net/daily-swig/lessons-learned-how-a-severe-vulnerability-in-the-owasp-modsecurity-core-rule-set-sparked-much-needed-change Exploit Third Party Advisory
https://portswigger.net/daily-swig/waf-bypass-severe-owasp-modsecurity-core-rule-set-bug-was-present-for-several-years Exploit Third Party Advisory
https://security.gentoo.org/glsa/202305-25
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