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Vulnerabilities

Vulnerability · CVE-1999-1053

guestbook.pl cleanses user-inserted SSI commands by removing text between " " separators, which allows remote attackers to execute arbitrary commands when guestbook.pl…

Published Sep 13, 1999 · catalog updated Jun 16, 2026 · http server

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check this week

CVE-1999-1053 is not in CISA KEV. FIRST estimates a 85.20% chance of exploitation in the next 30 days. Check whether you run http server.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
85.20%
Remediation
Advisory link
Affected products
cpe apache/http server · cpe matt wright/matt wright guestbook

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 "-->".

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/http server1.3.9
  • cpe matt wright/matt wright guestbook2.3

How to fix CVE-1999-1053

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-1999-1053 is not in CISA KEV. FIRST estimates a 85.20% chance of exploitation in the next 30 days. Check whether you run http server.

Which versions are affected?

Compare what you have installed with apache/http server 1.3.9; matt wright/matt wright guestbook 2.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 85.20%. There is no CISA KEV listing. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Technology hubs

Apache HTTP Server security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 13, 1999 · Monitored products — critical

    Detected

    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 "-->".

  2. Jun 16, 2026 · Monitored products — critical

    Updated

    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 "-->".

Sources

  • CVE.orgVulnerability recordCVE-1999-1053

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-1999-1053

    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 "-->".

    nvd.nist.gov
  • Metasploit ModulesPublic exploit moduleexploit_unix/webapp/guestbook_ssi_exec

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Metasploit ModulesNov 4, 2026
  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 3, 2026