Vulnerability in BSD

CVE-1999-1214

The asynchronous I/O facility in 4.4 BSD kernel does not check user credentials when setting the recipient of I/O notification, which allows local users to cause a denial of service by using certain ioctl and fcntl calls to cause the signal to be sent to an arbitrary process ID.

Published 1997-09-15 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 2.1 (Low). Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.003 (20.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000

Affected products

BSD — versions 4.4
FreeBSD — versions 6.2
NetBSD — versions 2.0.4
OpenBSD — versions 2.1
Sgi Irix

Weakness classification (CWE)

CWE-255

References

www.openbsd.com/advisories/signals.txt (vendor-advisory)
www.osvdb.org/11062 (vdb-entry)
exchange.xforce.ibmcloud.com/vulnerabilities/556 (vdb-entry)