How severe is CVE-1999-1053?

CVE-1999-1053 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-1999-1053 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 85% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1053?

CVE-1999-1053 primarily affects Apache Http Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1053?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-1999-1053 published?

CVE-1999-1053 was published on 1999-09-13 and last updated on 2026-06-16.

CVE-1999-1053

CVE-1999-1053 is a high-severity vulnerability in Apache Http Server with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 85% places it in the 100th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 85% (100th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apache Http Server
Published: 1999-09-13
Last modified: 2026-06-16

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 "-->".

Frequently asked questions

What is 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 is run on Apache 1.3.9 and possibly other versions, since Apache allows other closing sequences besides "-->".
How severe is CVE-1999-1053?: CVE-1999-1053 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-1053 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 85% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1053?: CVE-1999-1053 primarily affects Apache Http Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1053?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-1053 published?: CVE-1999-1053 was published on 1999-09-13 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:apache:http_server:1.3.9:*:*:*:*:*:*:*
cpe:2.3:a:matt_wright:matt_wright_guestbook:2.3:*:*:*:*:*:*:*

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