CVE-1999-0821

NONECVSS 0.0Weaponized

0.0

FreeBSD seyon allows local users to gain privileges by providing a malicious program in the -emulator argument.

CVSS v3: —
EG Score: —
EPSS: 57.5%
KEV: Not listed

Published

November 8, 1999

Last Modified

April 16, 2026

References (2)

cve@mitrehttp://www.securityfocus.com/bid/838
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/838

Data Freshness Timeline

(refreshed 13× 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
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Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-252✓ verified
First seen Jan 15, 2001
Seyon 2.1 rev. 4b i586-Linux (RedHat 4.0/5.1) - Local Overflow
Open source ↗
Exploit-DBEDB-19651✓ verified
First seen Dec 1, 1999
FreeBSD 3.3 - Seyon SetGID Dialer
Open source ↗

Frequently asked(4)

What is CVE-1999-0821?

CVE-1999-0821 is a none vulnerability published on November 8, 1999. FreeBSD seyon allows local users to gain privileges by providing a malicious program in the -emulator argument.

When was CVE-1999-0821 disclosed?

CVE-1999-0821 was first published in the National Vulnerability Database on November 8, 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-1999-0821 actively exploited?

CVE-1999-0821 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 57.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-0821?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0821, 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-1999-0821

📅 Published

🔄 Last Modified

🔗 References (2)