CVE-2025-48866: owasp-modsecurity modsecurity
Vulnerability summary
CVE-2025-48866 is a high (CVSS 7.5) vulnerability in owasp-modsecurity modsecurity. EPSS estimates a 0.83% chance of exploitation in the next 30 days, higher than 56.7% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 7 · Related 5Timeline
- 02-06-2025PublishedVulnerability first disclosed.
- 09-06-2025Last modifiedVulnerability information updated.
Description
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions prior to 2.9.10 contain a denial of service vulnerability similar to GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` - this is the same action but an alias) is vulnerable to adding an excessive number of arguments, thereby leading to denial of service. Version 2.9.10 fixes the issue. As a workaround, avoid using rules that contain the `sanitiseArg` (or `sanitizeArg`) action.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · Red hatEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.83%
Chance of exploitation in the next 30 days
Percentile
57%
Versus all other CVEs
30-day change
0.00 pp
From 0.83% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundModsecurity
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Redhat5 products
- mod_security< 0:2.9.6-2.el9_6.1 | < 0:2.9.6-1.el9_4.2 | < 0:2.9.3-12.el9_0.2 | < 0:2.9.6-1.el9_2.2
- mod_security-debuginfo< 0:2.9.6-2.el9_6.1 | < 0:2.9.6-1.el9_4.2 | < 0:2.9.3-12.el9_0.2 | < 0:2.9.6-1.el9_2.2
- mod_security-debugsource< 0:2.9.6-2.el9_6.1 | < 0:2.9.6-1.el9_4.2 | < 0:2.9.3-12.el9_0.2 | < 0:2.9.6-1.el9_2.2
- mod_security-mlogc< 0:2.9.6-2.el9_6.1 | < 0:2.9.6-1.el9_4.2 | < 0:2.9.3-12.el9_0.2 | < 0:2.9.6-1.el9_2.2
- mod_security-mlogc-debuginfo< 0:2.9.6-2.el9_6.1 | < 0:2.9.6-1.el9_4.2 | < 0:2.9.3-12.el9_0.2 | < 0:2.9.6-1.el9_2.2
Debian1 product
- modsecurity-apache< 2.9.7-1+deb12u1 | < 2.9.10-1 | < 2.9.3-3+deb11u4
Owasp1 product
- modsecurity< 2.9.10
Owasp-modsecurity1 product
- modsecurity< 2.9.10
Ubuntu1 product
- modsecurity-apache< 2.7.7-2ubuntu0.1~esm2 | < 2.9.0-1ubuntu0.1~esm2 | < 2.9.2-1ubuntu0.1~esm2 | < 2.9.3-1ubuntu0.1+esm1 | < 2.9.5-1ubuntu0.1~esm2 | < 2.9.7-1ubuntu0.24.04.1~esm1 | All versions (No fix recorded)
5 vendors · 9 products
References
22 links- github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-f82j-8pp7-cw2wX Refsource CONFIRMARTICLEREPORTExploitVendor Advisory
- github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8rX Refsource MISCARTICLEREPORTNot Applicable
- github.com/owasp-modsecurity/ModSecurity/commit/3a54ccea62d3f7151bb08cb78d60c5e90b53ca2eX Refsource MISCARTICLEREPORTPatch
- github.com/owasp-modsecurity/ModSecurity/wiki/Reference-Manual-(v2.x)X Refsource MISCARTICLEREPORTProduct
