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

published 1999-11-08 27 y ago modified 2026-06-16 4 mo ago also EUVD-1999-0802

cvss: 4.6; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 2; Exploit-DB

Timeline

1999-11-08 Published
1999-12-01 First public exploit (EDB-19651)

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-19651 FreeBSD 3.3 - Seyon SetGID Dialer local, 1999-12-01
EDB-252 Seyon 2.1 rev. 4b i586-Linux (RedHat 4.0/5.1) - Local Overflow local, 2001-01-15

CVSS scores

assigned by	version	score	vector
NVD	2.0	4.6	AV:L/AC:L/Au:N/C:P/I:P/A:P

References

securityfocus.com /bid/838
vdb-entry

Sources

CVE List CVE-1999-0821
NVD CVE-1999-0821

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary