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    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.

    Published:Mar 29, 2004
    Last Modified:Apr 16, 2026
    EPS:Sep 1, 2004
    EPSS Score:0.05029
    CVSS Score:7.5

    Affected Products

    Vendor
    Apache
    Product
    Http Server

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-48913 (CVSS 7.3) — Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. …
    CVE-2026-42536 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted…
    CVE-2026-44185 (CVSS 7.3) — Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled OCSP…
    CVE-2026-34355 (CVSS 7.5) — A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted …
    CVE-2026-44631 (CVSS 9.8) — Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. Th…
    CVE-2026-44119 (CVSS 5.5) — Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local .htaccess au…
    CVE-2026-43951 (CVSS 6.5) — Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response lan…
    CVE-2026-42535 (CVSS 9.1) — A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to directly ma…
    CVE-2026-34356 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassRev…
    CVE-2026-44186 (CVSS 7.3) — Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache HTT…

    References

    http://frontal2.mandriva.com/security/advisories?name=MDKSA-2004:046
    http://issues.apache.org/bugzilla/show_bug.cgi?id=23850
    http://marc.info/?l=apache-cvs&m=107869603013722
    http://marc.info/?l=bugtraq&m=108437852004207&w=2
    http://security.gentoo.org/glsa/glsa-200405-22.xml
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-101555-1
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-101841-1
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-57628-1
    http://www.apacheweek.com/features/security-13
    http://www.securityfocus.com/bid/9829
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2004&m=slackware-security.529643
    http://www.trustix.org/errata/2004/0027
    https://exchange.xforce.ibmcloud.com/vulnerabilities/15422
    https://lists.apache.org/thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r7035b7c9091c4b665a3b7205364775410646f12125d48e74e395f2ce%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/raa117ef183f0da9b3f46efbeaa66f7622bd68868a450cae4fd8ed594%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/re028d61fe612b0908595d658b9b39e74bca56f2a1ed3c5f06b5ab571%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf2f0f3611f937cf6cfb3b4fe4a67f69885855126110e1e3f2fb2728e%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100111
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4670
    http://frontal2.mandriva.com/security/advisories?name=MDKSA-2004:046
    http://issues.apache.org/bugzilla/show_bug.cgi?id=23850
    http://marc.info/?l=apache-cvs&m=107869603013722
    http://marc.info/?l=bugtraq&m=108437852004207&w=2
    http://security.gentoo.org/glsa/glsa-200405-22.xml
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-101555-1
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-101841-1
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-57628-1
    http://www.apacheweek.com/features/security-13
    http://www.securityfocus.com/bid/9829
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2004&m=slackware-security.529643
    http://www.trustix.org/errata/2004/0027
    https://exchange.xforce.ibmcloud.com/vulnerabilities/15422
    https://lists.apache.org/thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r7035b7c9091c4b665a3b7205364775410646f12125d48e74e395f2ce%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/raa117ef183f0da9b3f46efbeaa66f7622bd68868a450cae4fd8ed594%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/re028d61fe612b0908595d658b9b39e74bca56f2a1ed3c5f06b5ab571%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf2f0f3611f937cf6cfb3b4fe4a67f69885855126110e1e3f2fb2728e%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100111
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4670

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High