CVE-2004-0940

CVE-2004-0940 is a high-severity vulnerability in Apache Http Server with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-131.

Key facts

• Severity: High (CVSS 3.x base score 7.8)
• CVSS v2: 6.9
• EPSS exploit prediction: 5% (91st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-131
• Affected product: Apache Http Server
• Published: 2005-02-09
• Last modified: 2026-06-16

Description

Buffer overflow in the get_tag function in mod_include for Apache 1.3.x to 1.3.32 allows local users who can create SSI documents to execute arbitrary code as the apache user via SSI (XSSI) documents that trigger a length calculation error.

Frequently asked questions

What is CVE-2004-0940?

Buffer overflow in the get_tag function in mod_include for Apache 1.3.x to 1.3.32 allows local users who can create SSI documents to execute arbitrary code as the apache user via SSI (XSSI) documents that trigger a length calculation error.

How severe is CVE-2004-0940?

CVE-2004-0940 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2004-0940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0940?

CVE-2004-0940 primarily affects Apache Http Server. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0940?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2004-0940 published?

CVE-2004-0940 was published on 2005-02-09 and last updated on 2026-06-16.

References

• http://marc.info/?l=bugtraq&m=109906660225051&w=2
• http://secunia.com/advisories/12898/
• http://secunia.com/advisories/19073
• http://securitytracker.com/id?1011783
• http://sunsolve.sun.com/search/document.do?assetkey=1-26-102197-1
• http://support.avaya.com/elmodocs2/security/ASA-2006-081.htm
• http://www.apacheweek.com/features/security-13
• http://www.debian.org/security/2004/dsa-594
• http://www.mandriva.com/security/advisories?name=MDKSA-2004:134
• http://www.redhat.com/support/errata/RHSA-2004-600.html
• http://www.redhat.com/support/errata/RHSA-2005-816.html
• http://www.securityfocus.com/bid/11471
• http://www.vupen.com/english/advisories/2006/0789
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17785
• https://lists.apache.org/thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/r734a07156abf332d5ab27fb91d9d962cacfef4f3681e44056f064fa8%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/rd65d8ba68ba17e7deedafbf5bb4899f2ae4dad781d21b931c2941ac3%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/re895fc1736d25c8cf57e102c871613b8aeec9ea26fd8a44e7942b5ab%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

Affected products (21)

• cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
• cpe:2.3:a:openpkg:openpkg:2.0:*:*:*:*:*:*:*
• cpe:2.3:a:openpkg:openpkg:2.1:*:*:*:*:*:*:*
• cpe:2.3:a:openpkg:openpkg:2.2:*:*:*:*:*:*:*
• cpe:2.3:o:hp:hp-ux:11.00:*:*:*:*:*:*:*
• cpe:2.3:o:hp:hp-ux:11.11:*:*:*:*:*:*:*
• cpe:2.3:o:hp:hp-ux:11.20:*:*:*:*:*:*:*
• cpe:2.3:o:hp:hp-ux:11.22:*:*:*:*:*:*:*
• cpe:2.3:o:slackware:slackware_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:slackware:slackware_linux:8.1:*:*:*:*:*:*:*
• cpe:2.3:o:slackware:slackware_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:slackware:slackware_linux:9.1:*:*:*:*:*:*:*
• cpe:2.3:o:slackware:slackware_linux:10.0:*:*:*:*:*:*:*
• cpe:2.3:o:slackware:slackware_linux:current:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux:8.1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux:8.2:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux:9.1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux:9.2:*:*:*:*:*:*:*
• cpe:2.3:o:trustix:secure_linux:1.5:*:*:*:*:*:*:*

More vulnerabilities in Apache Http Server

• CVE-2010-0425 — Critical (CVSS 10.0): modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 through 2.2.14, and…
• CVE-2005-2700 — Critical (CVSS 10.0): ssl_engine_kernel.c in mod_ssl before 2.8.24, when using "SSLVerifyClient optional" in the global virtual host…
• CVE-2004-0492 — Critical (CVSS 10.0): Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a…
• CVE-2003-0789 — Critical (CVSS 10.0): mod_cgid in Apache before 2.0.48, when using a threaded MPM, does not properly handle CGI redirect paths, which could…
• CVE-1999-1293 — Critical (CVSS 10.0): mod_proxy in Apache 1.2.5 and earlier allows remote attackers to cause a denial of service via malformed FTP commands,…
• CVE-1999-0926 — Critical (CVSS 10.0): Apache allows remote attackers to conduct a denial of service via a large number of MIME headers.

All CVEs affecting Apache Http Server →

Other CWE-131 (Incorrect Calculation of Buffer Size) vulnerabilities

• CVE-2026-52955 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in…
• CVE-2026-41676 — Critical (CVSS 9.8): rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78,…
• CVE-2026-1949 — Critical (CVSS 9.8): Delta Electronics AS320T has incorrect calculation of the buffer size on the stack in the GET/PUT request handler of…
• CVE-2026-20911 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the HuffTable::initval functionality of LibRaw Commit 0b56545 and…
• CVE-2025-1861 — Critical (CVSS 9.8): In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when…
• CVE-2023-5941 — Critical (CVSS 9.8): In versions of FreeBSD 12.4-RELEASE prior to 12.4-RELEASE-p7 and FreeBSD 13.2-RELEASE prior to 13.2-RELEASE-p5 the…

Browse all CWE-131 (Incorrect Calculation of Buffer Size) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 90.160.135.217 (ipv4-addr)
• 62.36.19.42 (ipv4-addr)
• 62.36.19.41 (ipv4-addr)