NVD / CVE Program· CNA redhat

CVE-2011-3192: The byterange filter in the Apache HTTP Server 1.3.x, 2.0.x through 2.0.64, and 2.2.x through 2.2.19 allows remote attackers to cause a…

HighCVSS 7.8 · v2.0—Weaponized Fix available

Noroxi assessment

Priority: This week (action score 61/100)

A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
Public proof-of-concept code exists (Exploit-DB, GitHub); there is no record of exploitation in the wild.
Probability of exploitation in the next 30 days: 98.9% (FIRST EPSS); higher than 99.9% of all records.
No special conditions are required; it is repeatable.
Fixed version: apache2 (Debian:12) 2.2.19-2; apache2 (Debian:5.0) 2.2.9-10+lenny10; apache2 (Debian:6.0) 2.2.16-6+squeeze2.

Don’t wait for the next maintenance window. Upgrade to apache2 (Debian:12) 2.2.19-2; apache2 (Debian:5.0) 2.2.9-10+lenny10; apache2 (Debian:6.0) 2.2.16-6+squeeze2 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

The byterange filter in the Apache HTTP Server 1.3.x, 2.0.x through 2.0.64, and 2.2.x through 2.2.19 allows remote attackers to cause a denial of service (memory and CPU consumption) via a Range header that expresses multiple overlapping ranges, as exploited in the wild in August 2011, a different vulnerability than CVE-2007-0086.

Published: Aug 29, 2011
Updated: Jun 16, 2026
EPSS: 98.9% · 99th percentile
CWE: CWE-400

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Action score

This week

Don’t wait for the next maintenance window.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 30 / 30 · 98.9%

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Not in KEV: no record of exploitation in the wild
Weaponized exploit exists
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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.

Vendor	Product	CPE
apache	http server	cpe:2.3:a:apache:http_server
opensuse	opensuse	cpe:2.3:o:opensuse:opensuse
suse	linux enterprise server	cpe:2.3:o:suse:linux_enterprise_server
suse	linux enterprise software development kit	cpe:2.3:o:suse:linux_enterprise_software_development_kit
canonical	ubuntu linux	cpe:2.3:o:canonical:ubuntu_linux

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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 server2.0.35 and later · before 2.0.65
apache http server2.2.0 and later · before 2.2.20

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 2.2.19-2	2.2.19-2
Debian:5.0	apache2	before 2.2.9-10+lenny10	2.2.9-10+lenny10
Debian:6.0	apache2	before 2.2.16-6+squeeze2	2.2.16-6+squeeze2
Red Hat:enterprise_linux:4::as	httpd	before 0:2.0.52-48.ent	0:2.0.52-48.ent
Red Hat:enterprise_linux:4::as	httpd-debuginfo	before 0:2.0.52-48.ent	0:2.0.52-48.ent
Red Hat:enterprise_linux:4::as	httpd-devel	before 0:2.0.52-48.ent	0:2.0.52-48.ent
Red Hat:enterprise_linux:4::as	httpd-manual	before 0:2.0.52-48.ent	0:2.0.52-48.ent
Red Hat:enterprise_linux:4::as	httpd-suexec	before 0:2.0.52-48.ent	0:2.0.52-48.ent
Red Hat:enterprise_linux:4::as	mod_ssl	before 1:2.0.52-48.ent	1:2.0.52-48.ent
Red Hat:enterprise_linux:5::client	httpd	before 0:2.2.3-53.el5_7.1	0:2.2.3-53.el5_7.1
Red Hat:enterprise_linux:5::client	httpd-debuginfo	before 0:2.2.3-53.el5_7.1	0:2.2.3-53.el5_7.1
Red Hat:enterprise_linux:5::client	mod_ssl	before 1:2.2.3-53.el5_7.1	1:2.2.3-53.el5_7.1
Red Hat:enterprise_linux:5::client_workstation	httpd-devel	before 0:2.2.3-53.el5_7.1	0:2.2.3-53.el5_7.1
Red Hat:enterprise_linux:5::client_workstation	httpd-manual	before 0:2.2.3-53.el5_7.1	0:2.2.3-53.el5_7.1
Red Hat:enterprise_linux:5::server	httpd	before 0:2.2.3-45.el5_6.2	0:2.2.3-45.el5_6.2
Red Hat:enterprise_linux:5::server	httpd-debuginfo	before 0:2.2.3-45.el5_6.2	0:2.2.3-45.el5_6.2
Red Hat:enterprise_linux:5::server	httpd-devel	before 0:2.2.3-45.el5_6.2	0:2.2.3-45.el5_6.2
Red Hat:enterprise_linux:5::server	httpd-manual	before 0:2.2.3-45.el5_6.2	0:2.2.3-45.el5_6.2
Red Hat:enterprise_linux:5::server	mod_ssl	before 1:2.2.3-45.el5_6.2	1:2.2.3-45.el5_6.2
Red Hat:enterprise_linux:6::server	httpd	before 0:2.2.15-9.el6_1.2	0:2.2.15-9.el6_1.2
Red Hat:enterprise_linux:6::server	httpd-debuginfo	before 0:2.2.15-9.el6_1.2	0:2.2.15-9.el6_1.2
Red Hat:enterprise_linux:6::server	httpd-devel	before 0:2.2.15-9.el6_1.2	0:2.2.15-9.el6_1.2
Red Hat:enterprise_linux:6::server	httpd-manual	before 0:2.2.15-9.el6_1.2	0:2.2.15-9.el6_1.2
Red Hat:enterprise_linux:6::server	httpd-tools	before 0:2.2.15-9.el6_1.2	0:2.2.15-9.el6_1.2

+39

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-2010-2791Aug 5, 2010 · mod_proxy in httpd in Apache HTTP Server 2.2.9, when running on Unix, does not close the backend connection if a timeout occurs when…
22Monitor
← EarlierCVE-2011-2688Jul 28, 2011 · SQL injection vulnerability in mysql/mysql-auth.pl in the mod_authnz_external module 3.2.5 and earlier for the Apache HTTP Server allows…
32Monitor
Later →CVE-2011-3348Sep 20, 2011 · The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with mod_proxy_balancer in certain configurations, allows…
24Monitor

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	2.2.19-2 · Debian:12	Package registry (OSV)
red hat:httpd	0:2.0.52-48.ent · Red Hat:enterprise_linux:4::as	Package registry (OSV)
red hat:httpd-debuginfo	0:2.0.52-48.ent · Red Hat:enterprise_linux:4::as	Package registry (OSV)
red hat:httpd-devel	0:2.0.52-48.ent · Red Hat:enterprise_linux:4::as	Package registry (OSV)
red hat:httpd-manual	0:2.0.52-48.ent · Red Hat:enterprise_linux:4::as	Package registry (OSV)
red hat:httpd-suexec	0:2.0.52-48.ent · Red Hat:enterprise_linux:4::as	Package registry (OSV)
red hat:httpd-tools	0:2.2.15-9.el6_1.2 · Red Hat:enterprise_linux:6::server	Package registry (OSV)
red hat:httpd22	0:2.2.17-16.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4	Package registry (OSV)
red hat:httpd22-apr	0:2.2.17-16.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4	Package registry (OSV)
red hat:httpd22-apr-devel	0:2.2.17-16.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4	Package registry (OSV)
red hat:httpd22-apr-util	0:2.2.17-16.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4	Package registry (OSV)
red hat:httpd22-apr-util-devel	0:2.2.17-16.ep5.el4 · Red Hat:jboss_enterprise_web_server:1::el4	Package registry (OSV)
red hat:mod_ssl	1:2.0.52-48.ent · Red Hat:enterprise_linux:4::as	Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Metasploit module ×1
Exploit-DB entry ×2
Proof-of-concept repository on GitHub ×4

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.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	4 repositories	2011-10-26 → 2026-05-14
Exploit-DB entry	dos	2011-12-09
Exploit-DB entry	dos	2011-08-19
Metasploit module	auxiliary/dos/http/apache_range_dosApache Range Header DoS (Apache Killer)auxiliary	2011-08-19

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.

First PoCAug 19, 2011-10 d
MetasploitAug 19, 2011-10 d
PublishedAug 29, 2011
TodayNov 15, 2026+5557 d

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: C · the service can be disrupted

Attack complexity: Low
Confidentiality impact: None
Integrity impact: None
Availability impact: C

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

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)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:47 PM UTC

For records you follow, these changes also arrive as notifications. →

References

archives.neohapsis.com/archives/fulldisclosure/2011-08/0285.html

Show all references (19 more)

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

All records

Noroxi analysis

What does it mean in your environment?

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Data sources and verification

CNA: redhat

CVE.org (CNA)Aug 6, 2024, 11:29 PM UTC
NVDJun 16, 2026, 7:32 PM UTC
FIRST EPSSNov 11, 2026, 12:00 AM UTC
OSV / GHSANov 15, 2026, 3:15 AM UTC
Exploit-DBNov 15, 2026, 3:15 AM UTC
MetasploitNov 15, 2026, 3:15 AM UTC
PoC-in-GitHubNov 15, 2026, 3:15 AM UTC

Each line is when that source was last processed for this record.

CVE-2011-3192: The byterange filter in the Apache HTTP Server 1.3.x, 2.0.x through 2.0.64, and 2.2.x through 2.2.19 allows remote attackers to cause a…

Noroxi assessment

Get told when this record changes

Follow CVE-2011-3192

What does it mean in your environment?

Affected systems

Is your version affected?

Watch new CVEs for http server

Affected versions

Package-level exposure

Same product

Remediation

Which version to upgrade to

Exploit status

Research context

Timeline

Technical details

Attack conditions

If successful

Root cause

The bug in code

Attack context

References