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Vulnerability record · CVE-2003-0899 · published 3 November 2003

CVE-2003-0899: Acme thttpd vulnerability

Acme · Thttpd

Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via requests that contain '<' or '>' characters, which trigger the overflow when the characters are expanded to "&lt;" and "&gt;" sequences.

9.8 CVSS 3.1 Critical EPSS 22% · top 2.4% CWE-131 · CWE-131
9.8CVSS 3.1 base score, v2 7.5
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via requests that contain '<' or '>' characters, which trigger the overflow when the characters are expanded to "&lt;" and "&gt;" sequences.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://marc.info/?l=bugtraq&m=106729188224252&w=2 ExploitMailing List
http://secunia.com/advisories/10092 Broken LinkPatchVendor Advisory
http://www.osvdb.org/2729 Broken Link
http://www.securityfocus.com/bid/8906 Broken LinkExploitPatchThird Party AdvisoryVDB Entry
http://www.texonet.com/advisories/TEXONET-20030908.txt Broken LinkURL Repurposed
https://exchange.xforce.ibmcloud.com/vulnerabilities/13530 Third Party AdvisoryVDB Entry
https://www.debian.org/security/2003/dsa-396 Broken Link
http://marc.info/?l=bugtraq&m=106729188224252&w=2 ExploitMailing List
http://secunia.com/advisories/10092 Broken LinkPatchVendor Advisory
http://www.osvdb.org/2729 Broken Link
http://www.securityfocus.com/bid/8906 Broken LinkExploitPatchThird Party AdvisoryVDB Entry
http://www.texonet.com/advisories/TEXONET-20030908.txt Broken LinkURL Repurposed
https://exchange.xforce.ibmcloud.com/vulnerabilities/13530 Third Party AdvisoryVDB Entry
https://www.debian.org/security/2003/dsa-396 Broken Link

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Related vulnerabilities

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

9.8CVE-2007-0158Acme thttpd out-of-bounds write vulnerabilitythttpd 2007 has buffer underflow.EPSS 1.3%9.8CVE-2017-17663Acme mini httpd memory buffer overflow vulnerabilityThe htpasswd implementation of mini_httpd before v1.28 and of thttpd before v2.28 is affected by a buffer overflow that can be exploited remotely to …EPSS 2.7%9.8CVE-2009-4491Acme thttpd improper input validation vulnerabilitythttpd 2.25b0 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, o…EPSS 14%9.8CVE-2001-1496Acme thttpd vulnerabilityOff-by-one buffer overflow in Basic Authentication in Acme Labs thttpd 1.95 through 2.20 allows remote attackers to cause a denial of service and pos…EPSS 4.8%5.5CVE-2012-5640Acme thttpd null pointer dereference vulnerabilitythttpd has a local DoS vulnerability via specially-crafted .htpasswd filesEPSS 0.39%5.0CVE-2001-0892Acme thttpd exposure of resource to wrong sphere vulnerabilityAcme Thttpd Secure Webserver before 2.22, with the chroot option enabled, allows remote attackers to view sensitive files under the document root (su…EPSS 1.9%2.1CVE-2013-0348Open source development team sthttpd permissions and access controls vulnerabilitythttpd.c in sthttpd before 2.26.4-r2 and thttpd 2.25b use world-readable permissions for /var/log/thttpd.log, which allows local users to obtain sens…EPSS 0.52%7.8CVE-2020-17087Windows Kernel Pool Buffer Overflow Local Privilege EscalationCVE-2020-17087 is a local elevation of privilege flaw in the Windows kernel, classified as CWE-131 (incorrect calculation of buffer size). A local at…KEVEPSS 5.4%analysed

Source: NIST National Vulnerability Database (record CVE-2003-0899), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.