The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64…
Priority LOW 13CWE-20Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the "len +=" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.
Why it matters now
EPSS 0.03019 87th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Will not fix Red Hat: no fix planned
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 55
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:http_server:2.0:*:*:*:*:*:*:* | 2.0 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.9:*:*:*:*:*:*:* | 2.0.9 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.28:*:*:*:*:*:*:* | 2.0.28 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.28:beta:*:*:*:*:*:* | 2.0.28 beta | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.32:*:*:*:*:*:*:* | 2.0.32 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.32:beta:*:*:*:*:*:* | 2.0.32 beta | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.34:beta:*:*:*:*:*:* | 2.0.34 beta | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.35:*:*:*:*:*:*:* | 2.0.35 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.36:*:*:*:*:*:*:* | 2.0.36 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.37:*:*:*:*:*:*:* | 2.0.37 | Vulnerable | Apache |
- cpe:2.3:a:apache:http_server:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.9:*:*:*:*:*:*:* Versions 2.0.9 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.28:*:*:*:*:*:*:* Versions 2.0.28 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.28:beta:*:*:*:*:*:* Versions 2.0.28 beta Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.32:*:*:*:*:*:*:* Versions 2.0.32 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.32:beta:*:*:*:*:*:* Versions 2.0.32 beta Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.34:beta:*:*:*:*:*:* Versions 2.0.34 beta Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.35:*:*:*:*:*:*:* Versions 2.0.35 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.36:*:*:*:*:*:*:* Versions 2.0.36 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.37:*:*:*:*:*:*:* Versions 2.0.37 Vulnerable ·Apache
Show 45 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:http_server:2.0.38:*:*:*:*:*:*:* | 2.0.38 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.39:*:*:*:*:*:*:* | 2.0.39 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.40:*:*:*:*:*:*:* | 2.0.40 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.41:*:*:*:*:*:*:* | 2.0.41 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.42:*:*:*:*:*:*:* | 2.0.42 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.43:*:*:*:*:*:*:* | 2.0.43 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.44:*:*:*:*:*:*:* | 2.0.44 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.45:*:*:*:*:*:*:* | 2.0.45 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.46:*:*:*:*:*:*:* | 2.0.46 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.47:*:*:*:*:*:*:* | 2.0.47 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.48:*:*:*:*:*:*:* | 2.0.48 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.49:*:*:*:*:*:*:* | 2.0.49 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.50:*:*:*:*:*:*:* | 2.0.50 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.51:*:*:*:*:*:*:* | 2.0.51 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.52:*:*:*:*:*:*:* | 2.0.52 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.53:*:*:*:*:*:*:* | 2.0.53 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.54:*:*:*:*:*:*:* | 2.0.54 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.55:*:*:*:*:*:*:* | 2.0.55 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.56:*:*:*:*:*:*:* | 2.0.56 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.57:*:*:*:*:*:*:* | 2.0.57 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.58:*:*:*:*:*:*:* | 2.0.58 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.59:*:*:*:*:*:*:* | 2.0.59 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.60:*:*:*:*:*:*:* | 2.0.60 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.61:*:*:*:*:*:*:* | 2.0.61 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.63:*:*:*:*:*:*:* | 2.0.63 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.0.64:*:*:*:*:*:*:* | 2.0.64 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.0:*:*:*:*:*:*:* | 2.2.0 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.1:*:*:*:*:*:*:* | 2.2.1 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.2:*:*:*:*:*:*:* | 2.2.2 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.3:*:*:*:*:*:*:* | 2.2.3 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.4:*:*:*:*:*:*:* | 2.2.4 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.6:*:*:*:*:*:*:* | 2.2.6 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.8:*:*:*:*:*:*:* | 2.2.8 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.9:*:*:*:*:*:*:* | 2.2.9 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.10:*:*:*:*:*:*:* | 2.2.10 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.11:*:*:*:*:*:*:* | 2.2.11 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.12:*:*:*:*:*:*:* | 2.2.12 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.13:*:*:*:*:*:*:* | 2.2.13 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.14:*:*:*:*:*:*:* | 2.2.14 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.15:*:*:*:*:*:*:* | 2.2.15 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.16:*:*:*:*:*:*:* | 2.2.16 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.18:*:*:*:*:*:*:* | 2.2.18 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.19:*:*:*:*:*:*:* | 2.2.19 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.20:*:*:*:*:*:*:* | 2.2.20 | Vulnerable | Apache |
| cpe:2.3:a:apache:http_server:2.2.21:*:*:*:*:*:*:* | 2.2.21 | Vulnerable | Apache |
- cpe:2.3:a:apache:http_server:2.0.38:*:*:*:*:*:*:* Versions 2.0.38 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.39:*:*:*:*:*:*:* Versions 2.0.39 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.40:*:*:*:*:*:*:* Versions 2.0.40 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.41:*:*:*:*:*:*:* Versions 2.0.41 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.42:*:*:*:*:*:*:* Versions 2.0.42 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.43:*:*:*:*:*:*:* Versions 2.0.43 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.44:*:*:*:*:*:*:* Versions 2.0.44 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.45:*:*:*:*:*:*:* Versions 2.0.45 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.46:*:*:*:*:*:*:* Versions 2.0.46 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.47:*:*:*:*:*:*:* Versions 2.0.47 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.48:*:*:*:*:*:*:* Versions 2.0.48 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.49:*:*:*:*:*:*:* Versions 2.0.49 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.50:*:*:*:*:*:*:* Versions 2.0.50 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.51:*:*:*:*:*:*:* Versions 2.0.51 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.52:*:*:*:*:*:*:* Versions 2.0.52 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.53:*:*:*:*:*:*:* Versions 2.0.53 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.54:*:*:*:*:*:*:* Versions 2.0.54 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.55:*:*:*:*:*:*:* Versions 2.0.55 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.56:*:*:*:*:*:*:* Versions 2.0.56 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.57:*:*:*:*:*:*:* Versions 2.0.57 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.58:*:*:*:*:*:*:* Versions 2.0.58 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.59:*:*:*:*:*:*:* Versions 2.0.59 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.60:*:*:*:*:*:*:* Versions 2.0.60 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.61:*:*:*:*:*:*:* Versions 2.0.61 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.63:*:*:*:*:*:*:* Versions 2.0.63 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.0.64:*:*:*:*:*:*:* Versions 2.0.64 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.0:*:*:*:*:*:*:* Versions 2.2.0 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.1:*:*:*:*:*:*:* Versions 2.2.1 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.2:*:*:*:*:*:*:* Versions 2.2.2 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.3:*:*:*:*:*:*:* Versions 2.2.3 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.4:*:*:*:*:*:*:* Versions 2.2.4 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.6:*:*:*:*:*:*:* Versions 2.2.6 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.8:*:*:*:*:*:*:* Versions 2.2.8 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.9:*:*:*:*:*:*:* Versions 2.2.9 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.10:*:*:*:*:*:*:* Versions 2.2.10 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.11:*:*:*:*:*:*:* Versions 2.2.11 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.12:*:*:*:*:*:*:* Versions 2.2.12 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.13:*:*:*:*:*:*:* Versions 2.2.13 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.14:*:*:*:*:*:*:* Versions 2.2.14 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.15:*:*:*:*:*:*:* Versions 2.2.15 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.16:*:*:*:*:*:*:* Versions 2.2.16 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.18:*:*:*:*:*:*:* Versions 2.2.18 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.19:*:*:*:*:*:*:* Versions 2.2.19 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.20:*:*:*:*:*:*:* Versions 2.2.20 Vulnerable ·Apache
- cpe:2.3:a:apache:http_server:2.2.21:*:*:*:*:*:*:* Versions 2.2.21 Vulnerable ·Apache
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Directory Server 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 4 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat JBoss Enterprise Web Server 1 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2011-4415
- 2026-10-03 Alias added: GHSA-43r8-mvrp-6q9c
References
More Apache Http Server vulnerabilities
- TI-2021-18535 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) KEVCVSS 3.1CRITICAL 9.8
- TI-2021-18417 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 KEVCVSS 3.1CRITICAL 9.8
- TI-2024-25716 Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. KEVCVSS 3.1CRITICAL 9.1
- TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
- TI-2019-00184 Use after free in Apache HTTP Server KEVCVSS 3.1HIGH 7.8
- TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2011-4415 · CVE Program
- CVE-2011-4415 · NVD
- FIRST EPSS
- GHSA-43r8-mvrp-6q9c · GitHub Advisory Database · CC BY 4.0
- CVE-2011-4415 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences