How severe is CVE-1999-0839?

CVE-1999-0839 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-1999-0839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0839?

CVE-1999-0839 primarily affects Microsoft Ie. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0839?

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-1999-0839 published?

CVE-1999-0839 was published on 1999-11-29 and last updated on 2026-06-16.

CVE-1999-0839

CVE-1999-0839 is a high-severity vulnerability in Microsoft Ie with a CVSS 2.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Severity: High (CVSS 2.0 base score 7.2)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Microsoft Ie
Published: 1999-11-29
Last modified: 2026-06-16

Description

Windows NT Task Scheduler installed with Internet Explorer 5 allows a user to gain privileges by modifying the job after it has been scheduled.

Frequently asked questions

What is CVE-1999-0839?: Windows NT Task Scheduler installed with Internet Explorer 5 allows a user to gain privileges by modifying the job after it has been scheduled.
How severe is CVE-1999-0839?: CVE-1999-0839 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-1999-0839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0839?: CVE-1999-0839 primarily affects Microsoft Ie. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0839?: 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-1999-0839 published?: CVE-1999-0839 was published on 1999-11-29 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:microsoft:ie:5:*:windows_nt_4.0:*:*:*:*:*
cpe:2.3:a:microsoft:ie:5.0:*:windows_95:*:*:*:*:*
cpe:2.3:a:microsoft:ie:5.0:*:windows_98:*:*:*:*:*

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