What’s Vulnerable › Vulnerabilities

CVE-1999-1053

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 85.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 1999-09-13 · updated 2026-06-16

Description

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 "-->".

Affected products

• Apache HTTP Server: 1.3.9
• Matt Wright Guestbook: 2.3

References

• http://www.securityfocus.com/archive/1/33674
• http://www.securityfocus.com/archive/82/27296
• http://www.securityfocus.com/archive/82/27560
• http://www.securityfocus.com/bid/776
• http://www.securityfocus.com/archive/1/33674
• http://www.securityfocus.com/archive/82/27296
• http://www.securityfocus.com/archive/82/27560
• http://www.securityfocus.com/bid/776

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