CVE-2003-0899

Name: CVE-2003-0899
Creator: NVD / NIST
Published: 2003-11-03T05:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 21.68%

Last modified Jun 16, 2026

CVE-2003-0899 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 "<" and ">" sequences.. EPSS estimates a 21.68% chance of exploitation in the next 30 days.

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 "<" and ">" sequences.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

21.68%

97.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-131

Affected Software

Vendor	Product	Versions
Acme	Thttpd	>= 2.21, < 2.23
Acme	Thttpd	2.23

References

http://marc.info/?l=bugtraq&m=106729188224252&w=2Exploit, Mailing List
http://secunia.com/advisories/10092Broken Link, Patch, Vendor Advisory
http://www.osvdb.org/2729Broken Link
http://www.securityfocus.com/bid/8906Broken Link, Exploit, Patch, Third Party Advisory, VDB Entry
http://www.texonet.com/advisories/TEXONET-20030908.txtBroken Link, URL Repurposed
https://exchange.xforce.ibmcloud.com/vulnerabilities/13530Third Party Advisory, VDB Entry
https://www.debian.org/security/2003/dsa-396Broken Link
http://marc.info/?l=bugtraq&m=106729188224252&w=2Exploit, Mailing List
http://secunia.com/advisories/10092Broken Link, Patch, Vendor Advisory
http://www.osvdb.org/2729Broken Link
http://www.securityfocus.com/bid/8906Broken Link, Exploit, Patch, Third Party Advisory, VDB Entry
http://www.texonet.com/advisories/TEXONET-20030908.txtBroken Link, URL Repurposed
https://exchange.xforce.ibmcloud.com/vulnerabilities/13530Third Party Advisory, VDB Entry
https://www.debian.org/security/2003/dsa-396Broken Link

Timeline

Published: Nov 3, 2003
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2003-0899?

How severe is CVE-2003-0899?

CVE-2003-0899 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 21.68% probability of exploitation in the next 30 days.

How do I fix CVE-2003-0899?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2003-0899?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST