Skip to content
Fencer Vulns
critical 9.8

CVE-2003-0899 in the critical feed json

Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via requests that conta…

published 2003-10-30 23 y ago modified 2026-06-16 4 mo ago also EUVD-2003-0889

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
22.2%
EPSS 22.2% chance of exploitation in 30 days, percentile 97%
public exploits
2
Exploit-DB

Summary

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.

Patch / fix

  • acme thttpd 2.23

Timeline

  1. First public exploit (EDB-23306)
  2. Published

Exploit prediction

22.19% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-23306 thttpd 2.2x - 'defang' Remote Buffer Overflow remote, 2003-10-27
  • EDB-23305 thttpd 2.2x - 'defang' Remote Buffer Overflow (PoC) dos, 2003-10-27
  • securityfocus.com http://www.securityfocus.com/bid/8906 referenced PoC, tagged "exploit" by a source, unverified
  • marc.info http://marc.info/?l=bugtraq&m=106729188224252&w=2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-131 Incorrect Calculation of Buffer Size

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.