The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, when the Revision 1179239 patch is in place, do
The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, when the Revision 1179239 patch is in place, does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.
- Published
- Nov 30, 2011
- Updated
- Jun 16, 2026
- EPSS
- 50.6% · 99th percentile
- CWE
- CWE-20
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 17 / 40 · 4.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 15 / 30 · 50.6%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| apache | http server2.0a7 | cpe:2.3:a:apache:http_server2.0a7 |
| apache | http server2.0a8 | cpe:2.3:a:apache:http_server2.0a8 |
| apache | http server | cpe:2.3:a:apache:http_server |
| apache | http server2.0a1 | cpe:2.3:a:apache:http_server2.0a1 |
| apache | http server2.0a2 | cpe:2.3:a:apache:http_server2.0a2 |
| apache | http server2.0a3 | cpe:2.3:a:apache:http_server2.0a3 |
| apache | http server2.0a4 | cpe:2.3:a:apache:http_server2.0a4 |
| apache | http server2.0a5 | cpe:2.3:a:apache:http_server2.0a5 |
| apache | http server2.0a6 | cpe:2.3:a:apache:http_server2.0a6 |
| apache | http server2.0a9 | cpe:2.3:a:apache:http_server2.0a9 |
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Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache http server2.0.11
- apache http server2.0.12
- apache http server2.0.13
- apache http server2.0.14
- apache http server2.0.15
- apache http server2.0.16
- apache http server2.0.17
- apache http server2.0.18
- apache http server2.0.19
- apache http server2.0.20
- apache http server2.0.21
- apache http server2.0.22
- apache http server2.0.23
- apache http server2.0.24
- apache http server2.0.25
- apache http server2.0.26
- apache http server2.0.27
- apache http server2.0.28
- apache http server2.0.29
- apache http server2.0.30
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | apache2 | before 2.2.18-1 | 2.2.18-1 |
| Debian:5.0 | apache2 | before 2.2.9-10+lenny12 | 2.2.9-10+lenny12 |
| Debian:6.0 | apache2 | before 2.2.16-6+squeeze6 | 2.2.16-6+squeeze6 |
| Red Hat:enterprise_linux:5::client | httpd | before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
| Red Hat:enterprise_linux:5::client | httpd-debuginfo | before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
| Red Hat:enterprise_linux:5::client | mod_ssl | before 1:2.2.3-63.el5_8.1 | 1:2.2.3-63.el5_8.1 |
| Red Hat:enterprise_linux:5::client_workstation | httpd-devel | before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
| Red Hat:enterprise_linux:5::client_workstation | httpd-manual | before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
| Red Hat:enterprise_linux:6::client | httpd | before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
| Red Hat:enterprise_linux:6::client | httpd-debuginfo | before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
| Red Hat:enterprise_linux:6::client | httpd-devel | before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
| Red Hat:enterprise_linux:6::client | httpd-manual | before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
| Red Hat:enterprise_linux:6::client | httpd-tools | before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
| Red Hat:enterprise_linux:6::client | mod_ssl | before 1:2.2.15-15.el6_2.1 | 1:2.2.15-15.el6_2.1 |
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV99Now
- CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV99Now
- CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV96Now
- CVE-2019-0211In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes orKEV81Now
- CVE-2021-44790Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier68This week
- CVE-2010-0425modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 through 2.2.14, and 2.3.x before 2.3.7, w68This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:apache2 | 2.2.18-1 · Debian:12 | Package registry (OSV) |
| red hat:httpd | 0:2.2.15-15.el6_2.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:httpd-debuginfo | 0:2.2.15-15.el6_2.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:httpd-devel | 0:2.2.15-15.el6_2.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:httpd-manual | 0:2.2.15-15.el6_2.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:httpd-tools | 0:2.2.15-15.el6_2.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:mod_ssl | 1:2.2.15-15.el6_2.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | remote | 2012-02-06 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+68 d
- TodaySep 30, 2026+5419 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
If successful
- Confidentiality
- none
- Integrity
- P · data or configuration can be modified
- Availability
- none
- Attack complexity
- M
- Confidentiality impact
- None
- Integrity impact
- P
- Availability impact
- None
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
AV:N/AC:M/Au:N/C:N/I:P/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- rhn.redhat.com/errata/RHSA-2012-0128.html
- svn.apache.org/viewvc?view=revision&revision=1188745
- www.debian.org/security/2012/dsa-2405
- bugzilla.redhat.com/show_bug.cgi?id=752080
Vendor advisories and official records. Exploit/PoC links are deliberately left out.