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CVE-2006-3747: Off-by-one error in the ldap scheme handling in the Rewrite module (mod_rewrite) in Apache 1.3 from 1.3.28, 2.0.46 and other versions before…

HighCVSS 7.6 · v2.0—Weaponized Fix available

Noroxi assessment

Priority: Plan (action score 59/100)

  • 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: 97.1% (FIRST EPSS); higher than 99.8% of all records.
  • Special conditions such as timing or configuration are required.
  • Fixed version: apache2 (Debian:12) 2.0.55-4.1; apache (Debian:3.1) 1.3.33-6sarge2; apache2 (Debian:3.1) 2.0.54-5sarge1.

Add it to your regular patch cycle. Upgrade to apache2 (Debian:12) 2.0.55-4.1; apache (Debian:3.1) 1.3.33-6sarge2; apache2 (Debian:3.1) 2.0.54-5sarge1 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

Off-by-one error in the ldap scheme handling in the Rewrite module (mod_rewrite) in Apache 1.3 from 1.3.28, 2.0.46 and other versions before 2.0.59, and 2.2, when RewriteEngine is enabled, allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted URLs that are not properly handled using certain rewrite rules.

Published
Jul 28, 2006
Updated
Jun 16, 2026
EPSS
97.1% · 99th percentile

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Action score

59

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
29 / 30 · 97.1%

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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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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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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
debiandebian linux

Using http server? Add it to your stack and be the first to know about CVEs like this one. (Apache HTTP)

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When you'll hear from us

  • when a new CVE affecting this product is published
  • when a record in your stack enters KEV or is weaponized

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Is Apache HTTP Server on your server exposed to the internet?Run a port scan

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every Monday

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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 server1.3.28 and later · before 1.3.37
  • apache http server2.0.46 and later · before 2.0.59
  • apache http server2.2.0 and later · before 2.2.3

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12apache2before 2.0.55-4.12.0.55-4.1
Debian:3.1apachebefore 1.3.33-6sarge21.3.33-6sarge2
Debian:3.1apache2before 2.0.54-5sarge12.0.54-5sarge1
openSUSE:Tumbleweedapache2before 2.4.49-1.12.4.49-1.1

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-2005-3357Dec 31, 2005 · mod_ssl in Apache 2.0 up to 2.0.55, when configured with an SSL vhost with access control and a custom error 400 error page, allows remote…
    28Monitor
  • ← EarlierCVE-2006-3918Jul 27, 2006 · http_protocol.c in (1) IBM HTTP Server 6.0 before 6.0.2.13 and 6.1 before 6.1.0.1, and (2) Apache HTTP Server 1.3 before 1.3.35, 2.0 before…
    46Plan
  • Later →CVE-2006-4110Aug 14, 2006 · Apache 2.2.2, when running on Windows, allows remote attackers to read source code of CGI programs via a request that contains uppercase…
    29Monitor

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:apache1.3.33-6sarge2 · Debian:3.1Package registry (OSV)
debian:apache22.0.55-4.1 · Debian:12Package registry (OSV)
opensuse:apache22.4.49-1.1 · openSUSE:TumbleweedPackage 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 ×4
  • Proof-of-concept repository on GitHub ×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.

Public exploit evidence
SourceKindDate
Exploit-DB entryremote2006-08-21
Exploit-DB entryremote2007-05-26
Exploit-DB entryremote2010-02-15
Exploit-DB entryremote2007-04-07
Metasploit moduleexploit/windows/http/apache_mod_rewrite_ldapApache Module mod_rewrite LDAP Protocol Buffer Overflowexploit2006-07-28
Proof-of-concept repository on GitHubstars:22016-11-26

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.

  1. Metasploit-1 d
  2. Published
  3. First PoC+23 d
  4. TodayNov 14, 2026+7413 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

  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
C · data can be read
Integrity
C · data or configuration can be modified
Availability
C · the service can be disrupted
Attack complexity
High
Confidentiality impact
C
Integrity impact
C
Availability impact
C

Weakness class (CWE)

CWE-189 · Numeric Errors

CVSS vector

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

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.

References

Show all references (19 more)

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

All records