CVE-2021-35368

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
85%
KEV
Not listed

Published

November 5, 2021

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Sep 19, 2026
⚠️ Active exploitation confirmed. Patch available.
generic Patch Available

[SECURITY] [DLA 3293-1] modsecurity-crs security update

https://lists.debian.org/debian-lts-announce/2023/01/msg00033.html
generic🔴 Active Exploitation

CVE-2021-35368 - CRS Request Body Bypass (Update) | CRS Project

https://coreruleset.org/20210630/cve-2021-35368-crs-request-body-bypass/
generic

OWASP ModSecurity Core Rule Set: Multiple Vulnerabilities (GLSA 202305-25) — Gentoo security

https://security.gentoo.org/glsa/202305-25
generic

PortSwigger — Web security tools, training and research

https://portswigger.net/daily-swig/waf-bypass-severe-owasp-modsecurity-core-rule-set-bug-was-present-for-several-years
generic

PortSwigger — Web security tools, training and research

https://portswigger.net/daily-swig/lessons-learned-how-a-severe-vulnerability-in-the-owasp-modsecurity-core-rule-set-sparked-much-needed-change
generic

[SECURITY] Fedora 37 Update: libmodsecurity-3.0.8-1.fc37 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IVYUJOKHDEXFTM2CZMEESJ6TZSPVNSSZ/
generic

[SECURITY] Fedora 36 Update: libmodsecurity-3.0.8-1.fc36 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MS5GMNYHFFIBWLJW7N3XAD24SLF3PFZ/
generic

OWASP CRS | OWASP Foundation

https://owasp.org/www-project-modsecurity-core-rule-set/

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
modsecurity-crs3.3.0-13.3.0-1+deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
modsecurity-crs—3.3.2-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
modsecurity-crs—3.3.2-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
modsecurity-crs—3.3.2-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 166 total refreshes for this CVE.

  1. 2026-09-19 15:38 UTCEPSS rescore
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  40. 2026-07-23 02:02 UTCEG score recompute
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  75. 2026-06-30 07:00 UTCOSV refresh

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Frequently asked(5)

What is CVE-2021-35368?
CVE-2021-35368 is a critical vulnerability published on November 5, 2021. 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.
When was CVE-2021-35368 disclosed?
CVE-2021-35368 was first published in the National Vulnerability Database on November 5, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-35368 actively exploited?
CVE-2021-35368 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 14.6% of all scored CVEs.
What is the CVSS score of CVE-2021-35368?
CVE-2021-35368 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-35368?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-35368, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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