How severe is CVE-1999-0853?

CVE-1999-0853 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-1999-0853 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0853?

CVE-1999-0853 primarily affects Netscape Enterprise Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0853?

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

When was CVE-1999-0853 published?

CVE-1999-0853 was published on 1999-12-01 and last updated on 2026-06-16.

CVE-1999-0853

CVE-1999-0853 is a critical-severity vulnerability in Netscape Enterprise Server with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netscape Enterprise Server
Published: 1999-12-01
Last modified: 2026-06-16

Description

Buffer overflow in Netscape Enterprise Server and Netscape FastTrack Server allows remote attackers to gain privileges via the HTTP Basic Authentication procedure.

Frequently asked questions

What is CVE-1999-0853?: Buffer overflow in Netscape Enterprise Server and Netscape FastTrack Server allows remote attackers to gain privileges via the HTTP Basic Authentication procedure.
How severe is CVE-1999-0853?: CVE-1999-0853 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-1999-0853 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0853?: CVE-1999-0853 primarily affects Netscape Enterprise Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0853?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-1999-0853 published?: CVE-1999-0853 was published on 1999-12-01 and last updated on 2026-06-16.

References

http://www.securityfocus.com/bid/847

Affected products (4)

cpe:2.3:a:netscape:enterprise_server:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:netscape:enterprise_server:3.6:*:*:*:*:*:*:*
cpe:2.3:a:netscape:enterprise_server:3.6:sp2:*:*:*:*:*:*
cpe:2.3:a:netscape:fasttrack_server:3.01:*:*:*:*:*:*:*

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