CVE-2022-39958Response body bypass in OWASP ModSecurity Core Rule Set via repeated HTTP Range header submission with a small byte range
- 7.5HighCVSS base score
- 1.2%Exploitation in 30 daysEPSS · top 31% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively and to configure a CRS paranoia level of 3 or higher.
Timeline
ID reserved
By NCSC.ch
- 15 days later
· 15 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NCSC.chCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 1.2% · top 31% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
OWASP · ModSecurity Core Rule Set
- affected 3.0.x
- affected 3.1.x
- affected unspecified – ≤ 3.2.1
- affected unspecified – ≤ 3.3.2
What to do
Solution: upgrade to 3.2.2 or 3.3.3 and configure a CRS paranoia level of 3 or higher.
References
References7
- https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/ (opens in a new tab)x_transferred
- FEDORA-2022-90708b46e3 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2022-85a85c84b3 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2022-1fd73a5285 (opens in a new tab)vendor-advisoryx_transferred
- [debian-lts-announce] 20230130 [SECURITY] [DLA 3293-1] modsecurity-crs security update (opens in a new tab)mailing-listx_transferred
- GLSA-202305-25 (opens in a new tab)vendor-advisoryx_transferred
- https://lists.debian.org/debian-lts-announce/2025/08/msg00004.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2022-42402 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2022-39958)Record last updated .