CVE-1999-0877

NONECVSS 0.0Weaponized

0.0

Internet Explorer 5 allows remote attackers to read files via an ExecCommand method called on an IFRAME.

CVSS v3: —
EG Score: —
EPSS: 95.7%
KEV: Not listed

Published

October 1, 1999

Last Modified

April 16, 2026

References (4)

cve@mitrehttp://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ243638
cve@mitrehttps://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-042
af854a3a-2127-422b-91ae-364da2661108http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ243638
af854a3a-2127-422b-91ae-364da2661108https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-042

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 13:37 UTCepss_batch
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2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-24 16:42 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-21 22:38 UTCepss_batch
2026-05-20 22:36 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-18 21:29 UTCepss_batch
2026-05-18 21:29 UTCepss_batch

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-19539✓ verified
First seen Oct 11, 1999
Microsoft Internet Explorer 5.0/4.0.1 - iFrame
Open source ↗

Frequently asked(4)

What is CVE-1999-0877?

CVE-1999-0877 is a none vulnerability published on October 1, 1999. Internet Explorer 5 allows remote attackers to read files via an ExecCommand method called on an IFRAME.

When was CVE-1999-0877 disclosed?

CVE-1999-0877 was first published in the National Vulnerability Database on October 1, 1999, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-0877 actively exploited?

CVE-1999-0877 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-0877?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0877, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-1999-0877

📅 Published

🔄 Last Modified

🔗 References (4)