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Servers and applications

CVE-1999-1053

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 "-->".

Severity
High 7.5
Published
13 Sept 1999
Last changed
16 Jun 2026
Added to UpHeron
17 Oct 2026
Exploit chance
85% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Sources
NVD

Description

guestbook.pl cleanses user-inserted SSI commands by removing text between "" 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 "-->".

From NVD.

Affected software

SoftwareAffected versions
Apache HTTP ServerServers and applications · cpe:a:apache:http_server
  • Version 1.3.9

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-1999-1053
  • CVE.org https://www.cve.org/CVERecord?id=CVE-1999-1053