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CVE-2022-39958

19
FAUCET Score

CVE-2022-39958 is a response body bypass vulnerability in the OWASP ModSecurity Core Rule Set (CRS) affecting versions 3.0.x, 3.1.x, 3.2.1, and 3.3.2. An attacker can exfiltrate small, undetectable sections of data from a restricted backend resource by repeatedly sending HTTP Range headers, bypassing WAF protections. This vulnerability has a CVSS score of 7.5 (High), indicating a network-based attack with low complexity and high confidentiality impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0.0, < 3.2.2CPE matchmatch criteria
cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*
>= 3.3.0, < 3.3.3CPE matchmatch criteria
cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
36CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
37CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*

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:H/I:N/A:N

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

Exploit Intelligence

EPSS Score
0.99%
Probability of exploitation in next 30 days
EPSS Percentile
58.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0099 is in the 34th percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Vendor Patches (2)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mod_security_crs
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: mod_security_crs

Vendor Advisories (1)

redhatCVE-2022-39958Moderate

mod_security_crs: Small range header leading to response rule set bypass

Sep 19, 2022

References

lists.debian.org / debian-lts-announce/2025/08/msg00004.html
coreruleset.org / 20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves
PatchVendor Advisory
lists.debian.org / debian-lts-announce/2023/01/msg00033.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/HL2L2GF7GOCWPMJZDUE5OXDSXHGG3XUJ
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/PD56EAYNGB6E6QQH62LAYCONOP6OH5DZ
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/YPQ6CCMX3MU4A7MTCGQJA7VMJW3IQDXV
security.gentoo.org / glsa/202305-25