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CVE-2003-0899

9.8 · CRITICAL

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…

Published Nov 3, 2003acmeCWE-131EPSS 22.19%

Overview

CVE-2003-0899 is a critical-severity vulnerability affecting acme thttpd. It was published on November 3, 2003 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from acme. Update thttpd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
acmethttpd>= 2.21, < 2.23Affected

References

Refmarc.info/?l=bugtraq&m=106729188224252&w=2Refsecunia.com/advisories/10092Refwww.osvdb.org/2729Refwww.securityfocus.com/bid/8906Refwww.texonet.com/advisories/TEXONET-20030908.txtRefexchange.xforce.ibmcloud.com/vulnerabilities/13530Refwww.debian.org/security/2003/dsa-396Refmarc.info/?l=bugtraq&m=106729188224252&w=2Refsecunia.com/advisories/10092Refwww.osvdb.org/2729

How CyberStrike helps

Frequently asked questions

What is CVE-2003-0899?

CVE-2003-0899 is a critical-severity vulnerability affecting acme thttpd. It was published on November 3, 2003 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2003-0899?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2003-0899?

Check the references section for vendor advisories and patches from acme. Update thttpd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2003-0899?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2003-0899 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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