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CVE-2023-24021

25
FAUCET Score

CVE-2023-24021 describes a vulnerability in ModSecurity versions prior to 2.9.7, affecting Debian and Trustwave ModSecurity products. This flaw, stemming from incorrect handling of null bytes in file uploads, allows attackers to bypass the Web Application Firewall and potentially cause buffer over-reads. With a CVSS score of 7.5 (High), it presents a significant risk due to its network-based attack vector and low complexity, leading to a high impact on integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.9.7CPE matchmatch criteria
cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.91%
Probability of exploitation in next 30 days
EPSS Percentile
56.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0091 is in the 31st percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services for RHEL 8Fixed in: jbcs-httpd24-mod_security-0:2.9.3-29.el8jbcs
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-mod_security-0:2.9.3-29.el7jbcs
View patch
redhatpatch availablevia redhat_api
Product: Text-Only JBCSFixed in: mod_security
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mod_security
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: mod_security
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: httpd24-mod_security

Vendor Advisories (1)

redhatCVE-2023-24021Moderate

modsecurity: lacking the complete content in FILES_TMP_CONTENT leads to web application firewall bypass

Jan 20, 2023

References

github.com / SpiderLabs/ModSecurity/pull/2857
Issue TrackingPatch
github.com / SpiderLabs/ModSecurity/pull/2857/commits/4324f0ac59f8225aa44bc5034df60dbeccd1d334
Patch
github.com / SpiderLabs/ModSecurity/releases/tag/v2.9.7
Release Notes
lists.debian.org / debian-lts-announce/2023/01/msg00023.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/52TGCZCOHYBDCVWJYNN2PS4QLOHCXWTQ
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/SYRTXTOQQI6SB2TLI5QXU76DURSLS4XI
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/WCH6JM4I4MD4YABYFHSBDDOUFDGIFJKL