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Fencer Vulns
high 7.5

CVE-1999-1053 in the critical feed json

guestbook.pl cleanses user-inserted SSI commands by removing text between "<!--" and "-->" separators, which allows remote attackers to exe…

published 1999-09-13 27 y ago modified 2026-06-16 4 mo ago also EUVD-1999-1034

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
85.2%
EPSS 85.2% chance of exploitation in 30 days, percentile 99.7%
public exploits
3
Metasploit, Exploit-DB

Summary

guestbook.pl cleanses user-inserted SSI commands by removing text between "<!--" and "-->" separators, which allows remote attackers to execute arbitrary commands when guestbook.pl is run on Apache 1.3.9 and possibly other versions, since Apache allows other closing sequences besides "-->".

Patch / fix

Timeline

  1. Published
  2. First public exploit (Metasploit exploit/unix/webapp/guestbook_ssi_exec)

Exploit prediction

85.20% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/unix/webapp/guestbook_ssi_exec Matt Wright guestbook.pl Arbitrary Command Execution metasploit exploit, excellent rank, 1999-11-05
  • EDB-16914 The Matt Wright Guestbook.pl - Arbitrary Command Execution (Metasploit) webapps, 2010-07-03
  • EDB-9907 The Matt Wright Guestbook.pl 2.3.1 - Server-Side Include webapps, 1999-11-05
  • securityfocus.com http://www.securityfocus.com/bid/776 referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/archive/82/27296 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Technology feeds

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.