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Vulnerability record · CVE-2003-1171 · published 31 December 2003

CVE-2003-1171: Mod security vulnerability

Mod Security · Mod Security

Heap-based buffer overflow in the sec_filter_out function in mod_security 1.7RC1 through 1.7.1 in Apache 2 allows remote attackers to execute arbitrary code via a server side script that sends a large amount of data.

7.5 CVSS 2.0 High EPSS 4.6% · top 8.6%
7.5CVSS 2.0 base score
4.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

Heap-based buffer overflow in the sec_filter_out function in mod_security 1.7RC1 through 1.7.1 in Apache 2 allows remote attackers to execute arbitrary code via a server side script that sends a large amount of data.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://adsystems.com.pl/adg-mod_security171.txt
http://secunia.com/advisories/10085 PatchVendor Advisory
http://securitytracker.com/id?1008025 ExploitPatch
http://www.modsecurity.org/download/CHANGES
http://www.securityfocus.com/archive/1/342767 Patch
http://www.securityfocus.com/bid/8919 Patch
https://exchange.xforce.ibmcloud.com/vulnerabilities/13543
http://adsystems.com.pl/adg-mod_security171.txt
http://secunia.com/advisories/10085 PatchVendor Advisory
http://securitytracker.com/id?1008025 ExploitPatch
http://www.modsecurity.org/download/CHANGES
http://www.securityfocus.com/archive/1/342767 Patch
http://www.securityfocus.com/bid/8919 Patch
https://exchange.xforce.ibmcloud.com/vulnerabilities/13543

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2004-1765Mod security vulnerabilityOff-by-one buffer overflow in ModSecurity (mod_security) 1.7.4 for Apache 2.x, when SecFilterScanPost is enabled, allows remote attackers to execute …EPSS 4.7%6.8CVE-2007-1359Mod security vulnerabilityInterpretation conflict in ModSecurity (mod_security) 2.1.0 and earlier allows remote attackers to bypass request rules via application/x-www-form-ur…EPSS 6.6%

Source: NIST National Vulnerability Database (record CVE-2003-1171), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.