CVE-1999-0858
CVE-1999-0858 is a medium-severity vulnerability in Microsoft Internet Explorer with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-16.
Key facts
- Severity: Medium (CVSS 2.0 base score 5.0)
- EPSS exploit prediction: 13% (96th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-16
- Affected product: Microsoft Internet Explorer
- Published:
- Last modified:
Description
Internet Explorer 5 allows a remote attacker to modify the IE client's proxy configuration via a malicious Web Proxy Auto-Discovery (WPAD) server.
Frequently asked questions
- What is CVE-1999-0858?
- Internet Explorer 5 allows a remote attacker to modify the IE client's proxy configuration via a malicious Web Proxy Auto-Discovery (WPAD) server.
- How severe is CVE-1999-0858?
- CVE-1999-0858 has a CVSS 2.0 base score of 5.0, rated medium severity.
- Is CVE-1999-0858 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-1999-0858?
- CVE-1999-0858 affects Microsoft Internet Explorer. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-1999-0858?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-1999-0858 published?
- CVE-1999-0858 was published on 1999-12-02 and last updated on 2026-06-16.
References
- http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ247333
- http://www.securityfocus.com/bid/846
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-054
Affected products (1)
- cpe:2.3:a:microsoft:internet_explorer:5.0:*:*:*:*:*:*:*
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