The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker…
Priority MEDIUM 40CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-399 and the CVSS impact.
Summary
The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long request-processing time, which allows remote attackers to cause a denial of service (worker consumption) via an expensive request.
Why it matters now
EPSS 0.1747 97th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 3 advisories
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 · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| 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:2.2.17:*:*:*:*:*:*:* | 2.2.17 | 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:2.2.12:*:*:*:*:*:*:* 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:2.2.17:*:*:*:*:*:*:* Versions 2.2.17 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
Red Hat 3 advisories
- RHSA-2013:0512 Released 2013-02-20 · Red Hat rating Lowhttpd security, bug fix, and enhancement update
- Red Hat Enterprise Linux Desktop (v. 6) httpd-2.2.15-26.el6, httpd-tools-2.2.15-26.el6
- Red Hat Enterprise Linux Desktop Optional (v. 6) httpd-2.2.15-26.el6, httpd-devel-2.2.15-26.el6, httpd-manual-2.2.15-26.el6 +1
- Red Hat Enterprise Linux HPC Node (v. 6) httpd-2.2.15-26.el6, httpd-tools-2.2.15-26.el6
- Red Hat Enterprise Linux HPC Node Optional (v. 6) httpd-2.2.15-26.el6, httpd-devel-2.2.15-26.el6, httpd-manual-2.2.15-26.el6 +1
- Red Hat Enterprise Linux Server (v. 6) httpd-2.2.15-26.el6, httpd-devel-2.2.15-26.el6, httpd-devel-2.2.15-26.el6.ppc +3
- Red Hat Enterprise Linux Workstation (v. 6) httpd-2.2.15-26.el6, httpd-devel-2.2.15-26.el6, httpd-manual-2.2.15-26.el6 +2
- RHSA-2011:0897 Released 2011-06-22 · Red Hat rating ModerateJBoss Enterprise Web Server 1.0.2 update
- Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server ant-1.7.1-13.jdk6.ep5.el5, ant-antlr-1.7.1-13.jdk6.ep5.el5, ant-apache-bcel-1.7.1-13.jdk6.ep5.el5 +47
- Red Hat JBoss Enterprise Web Server 1 for RHEL 6 Server ant-1.7.1-14.ep5.el6, ant-antlr-1.7.1-14.ep5.el6, ant-apache-bcel-1.7.1-14.ep5.el6 +47
- Red Hat JBoss Web Server 1.0 for RHEL 4 AS ant-1.7.1-13.jdk6.ep5.el4, antlr-2.7.7-7.ep5.el4, bcel-5.2-8.1.ep5.el4 +47
- Red Hat JBoss Web Server 1.0 for RHEL 4 ES ant-1.7.1-13.jdk6.ep5.el4, antlr-2.7.7-7.ep5.el4, bcel-5.2-8.1.ep5.el4 +47
- RHSA-2011:0896 Released 2011-06-22 · Red Hat rating ModerateJBoss Enterprise Web Server 1.0.2 update
- Red Hat JBoss Web Server 1.0
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2013:0512 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2013:0512 |
| Red Hat Enterprise Linux HPC Node (v. 6) | Fixed | RHSA-2013:0512 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2013:0512 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2013:0512 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2013:0512 |
| Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server | Fixed | RHSA-2011:0897 |
| Red Hat JBoss Enterprise Web Server 1 for RHEL 6 Server | Fixed | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1.0 | Fixed | RHSA-2011:0896 |
| Red Hat JBoss Web Server 1.0 for RHEL 4 AS | Fixed | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1.0 for RHEL 4 ES | Fixed | RHSA-2011:0897 |
Not affected: 2 products
- Red Hat Enterprise Linux 4
- Red Hat Enterprise Linux 5
Timeline
- 2026-10-02 Threatist record created from CVE-2012-4557
- 2026-10-03 Alias added: GHSA-9p9q-h6h7-37g9
References
Other 17
- oval:org.mitre.oval:def:18938
- oval:org.mitre.oval:def:19284
- https://bugzilla.redhat.com/show_bug.cgi?id=871685
- [httpd-cvs] 20190815 svn commit: r1048743 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20190815 svn commit: r1048742 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20200401 svn commit: r1058586 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20200401 svn commit: r1058587 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/
- [httpd-cvs] 20210330 svn commit: r1073140 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210330 svn commit: r1073139 [8/13] - in /websites/staging/httpd/trunk/content: ./ security/json/
- [httpd-cvs] 20210330 svn commit: r1888194 [8/13] - /httpd/site/trunk/content/security/json/
- [httpd-cvs] 20210330 svn commit: r1073149 [9/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/
- [httpd-cvs] 20210330 svn commit: r1073146 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/
- [httpd-cvs] 20210603 svn commit: r1075360 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210606 svn commit: r1075467 [2/2] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
- [httpd-cvs] 20210606 svn commit: r1075470 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html
More Apache Http Server vulnerabilities
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- 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-2012-4557 · CVE Program
- CVE-2012-4557 · NVD
- FIRST EPSS
- GHSA-9p9q-h6h7-37g9 · GitHub Advisory Database · CC BY 4.0
- CVE-2012-4557 · 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