What is CVE-2007-6423?

CVE-2007-6423 is a vulnerability in Apache HTTP Server, classified under CWE-399. Published 2008-01-12.

Is CVE-2007-6423 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apache HTTP Server

CVE-2007-6423

Unspecified vulnerability in mod_proxy_balancer for Apache HTTP Server 2.2.x before 2.2.7-dev, when running on Windows, allows remote attackers to trigger memory corruption via a long URL. NOTE: the vendor could not reproduce this issue

Published 2008-01-12 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.8 (High). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.039 (89.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.039 · newest: 0.039 · change: 0.000

Affected products

Apache HTTP Server — versions 2.2.2, 2.2.3, 2.2.4
Microsoft Windows Nt

Weakness classification (CWE)

CWE-399

Public proof-of-concept exploits

References

securityreason.com/securityalert/3523 (third-party-advisory)
www.securityfocus.com/bid/27236 (vdb-entry)
www.securityfocus.com/archive/1/486169/100/0/threaded (mailing-list)

Frequently asked questions

What is CVE-2007-6423?: CVE-2007-6423 is a vulnerability in Apache HTTP Server, classified under CWE-399. Published 2008-01-12.
Is CVE-2007-6423 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.