UpHeron
All vulnerabilities

Servers and applications

CVE-2003-0993

mod_access in Apache 1.3 before 1.3.30, when running big-endian 64-bit platforms, does not properly parse Allow/Deny rules using IP addresses without a netmask, which could allow remote attackers to bypass intended access restrictions.

Severity
High 7.5
Published
29 Mar 2004
Last changed
16 Jun 2026
Added to UpHeron
17 Oct 2026
Exploit chance
11% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
Apache HTTP ServerServers and applications · cpe:a:apache:http_server
  • Version 1.3.29
  • Version 1.3.28
  • Version 1.3.27
  • Version 1.3.26
All 22 release lines
  • Version 1.3
  • Version 1.3.1
  • Version 1.3.3
  • Version 1.3.4
  • Version 1.3.6
  • Version 1.3.7
  • Version 1.3.9
  • Version 1.3.11
  • Version 1.3.12
  • Version 1.3.14
  • Version 1.3.17
  • Version 1.3.18
  • Version 1.3.19
  • Version 1.3.20
  • Version 1.3.22
  • Version 1.3.23
  • Version 1.3.24
  • Version 1.3.25
  • Version 1.3.26
  • Version 1.3.27
  • Version 1.3.28
  • Version 1.3.29

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2003-0993
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2003-0993