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CVE-2009-1191· NVD / CVE Program· CNA redhat

mod_proxy_ajp.c in the mod_proxy_ajp module in the Apache HTTP Server 2.2.11 allows remote attackers to obtain sensitive response data, inte

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 12.3% (FIRST EPSS); higher than 96.1% of all records.
  • No special conditions are required; it is repeatable.
  • Fixed version: apache2 (Debian:12) 2.2.11-4; apache2 (openSUSE:Tumbleweed) 2.4.23-4.1; httpd22 (Red Hat:jboss_enterprise_web_server:1::el4) 0:2.2.10-16.1.ep5.el4.

Low priority for now. Upgrade to apache2 (Debian:12) 2.2.11-4; apache2 (openSUSE:Tumbleweed) 2.4.23-4.1; httpd22 (Red Hat:jboss_enterprise_web_server:1::el4) 0:2.2.10-16.1.ep5.el4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

mod_proxy_ajp.c in the mod_proxy_ajp module in the Apache HTTP Server 2.2.11 allows remote attackers to obtain sensitive response data, intended for a client that sent an earlier POST request with no request body, via an HTTP request.

MediumCVSS 5.0 · v2.0—No exploit Fix available
Published
Apr 23, 2009
Updated
Jun 16, 2026
EPSS
12.3% · 96th percentile
CWE
—

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
20 / 40 · 5.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
4 / 30 · 12.3%

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  • Not in KEV: no record of exploitation in the wild
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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachehttp server
canonicalubuntu linux

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When you'll hear from us

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Is Apache HTTP Server on your server exposed to the internet?

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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 server2.2.11

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12apache2before 2.2.11-42.2.11-4
openSUSE:Tumbleweedapache2before 2.4.23-4.12.4.23-4.1
Red Hat:jboss_enterprise_web_server:1::el4httpd22before 0:2.2.10-16.1.ep5.el40:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el4httpd22-aprbefore 0:2.2.10-16.1.ep5.el40:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el4httpd22-apr-develbefore 0:2.2.10-16.1.ep5.el40:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el4httpd22-apr-utilbefore 0:2.2.10-16.1.ep5.el40:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el4httpd22-apr-util-develbefore 0:2.2.10-16.1.ep5.el40:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el4httpd22-debuginfobefore 0:2.2.10-16.1.ep5.el40:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el4httpd22-develbefore 0:2.2.10-16.1.ep5.el40:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el4mod_ssl22before 1:2.2.10-16.1.ep5.el41:2.2.10-16.1.ep5.el4
Red Hat:jboss_enterprise_web_server:1::el5httpdbefore 0:2.2.10-4.ep5.el50:2.2.10-4.ep5.el5
Red Hat:jboss_enterprise_web_server:1::el5httpd-develbefore 0:2.2.10-4.ep5.el50:2.2.10-4.ep5.el5
Red Hat:jboss_enterprise_web_server:1::el5httpd-manualbefore 0:2.2.10-4.ep5.el50:2.2.10-4.ep5.el5
Red Hat:jboss_enterprise_web_server:1::el5mod_sslbefore 1:2.2.10-4.ep5.el51:2.2.10-4.ep5.el5

Same product

apache: all records

Other 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)KEV
    99Now
  • CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV
    99Now
  • CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV
    96Now

Published before and after this one in the same product

  • ← EarlierCVE-2008-2939Aug 6, 2008 · Cross-site scripting (XSS) vulnerability in proxy_ftp.c in the mod_proxy_ftp module in Apache 2.0.63 and earlier, and mod_proxy_ftp.c in the
    29Monitor
  • ← EarlierCVE-2008-2384Jan 22, 2009 · SQL injection vulnerability in mod_auth_mysql.c in the mod-auth-mysql (aka libapache2-mod-auth-mysql) module for the Apache HTTP Server 2.x,
    31Monitor
  • Later →CVE-2009-1195May 28, 2009 · The Apache HTTP Server 2.2.11 and earlier 2.2 versions does not properly handle Options=IncludesNOEXEC in the AllowOverride directive, which
    20Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:apache22.2.11-4 · Debian:12Package registry (OSV)
opensuse:apache22.4.23-4.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:httpd0:2.2.10-4.ep5.el5 · Red Hat:jboss_enterprise_web_server:1::el5Package registry (OSV)
red hat:httpd-devel0:2.2.10-4.ep5.el5 · Red Hat:jboss_enterprise_web_server:1::el5Package registry (OSV)
red hat:httpd-manual0:2.2.10-4.ep5.el5 · Red Hat:jboss_enterprise_web_server:1::el5Package registry (OSV)
red hat:httpd220:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)
red hat:httpd22-apr0:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)
red hat:httpd22-apr-devel0:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)
red hat:httpd22-apr-util0:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)
red hat:httpd22-apr-util-devel0:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)
red hat:httpd22-debuginfo0:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)
red hat:httpd22-devel0:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)
red hat:mod_ssl1:2.2.10-4.ep5.el5 · Red Hat:jboss_enterprise_web_server:1::el5Package registry (OSV)
red hat:mod_ssl221:2.2.10-16.1.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

EPSS, last 120 days

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 researchers

Finders, 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

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
P · data can be read
Integrity
none
Availability
none
Attack complexity
Low
Confidentiality impact
P
Integrity impact
None
Availability impact
None

Weakness class (CWE)

—

CVSS vector

AV:N/AC:L/Au:N/C:P/I:N/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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records