How severe is CVE-1999-0777?

CVE-1999-0777 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-1999-0777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0777?

CVE-1999-0777 primarily affects Microsoft Commercial Internet System. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0777?

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-1999-0777 published?

CVE-1999-0777 was published on 1999-09-23 and last updated on 2026-06-16.

CVE-1999-0777

CVE-1999-0777 is a high-severity vulnerability in Microsoft Commercial Internet System with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-264.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Microsoft Commercial Internet System
Published: 1999-09-23
Last modified: 2026-06-16

Description

IIS FTP servers may allow a remote attacker to read or delete files on the server, even if they have "No Access" permissions.

Frequently asked questions

What is CVE-1999-0777?: IIS FTP servers may allow a remote attacker to read or delete files on the server, even if they have "No Access" permissions.
How severe is CVE-1999-0777?: CVE-1999-0777 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-0777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0777?: CVE-1999-0777 primarily affects Microsoft Commercial Internet System. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0777?: 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-1999-0777 published?: CVE-1999-0777 was published on 1999-09-23 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:commercial_internet_system:2.5:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:*:*:*:*

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