What is CVE-1999-0001?

CVE-1999-0001 is a vulnerability in Bsdi BSD OS, classified under Improper Input Validation. Published 1999-12-30.

Is CVE-1999-0001 known to be exploited?

20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Bsdi BSD OS

CVE-1999-0001

ip_input.c in BSD-derived TCP/IP implementations allows remote attackers to cause a denial of service (crash or hang) via crafted packets.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 1999-12-30 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/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: 0.034 (88.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000

Affected products

Bsdi BSD OS — versions 3.1
FreeBSD — versions 1.0, 1.1, 1.1.5.1
OpenBSD — versions 2.3, 2.4

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

www.openbsd.org/errata23.html
www.osvdb.org/5707 (vdb-entry)

Frequently asked questions

What is CVE-1999-0001?: CVE-1999-0001 is a vulnerability in Bsdi BSD OS, classified under Improper Input Validation. Published 1999-12-30.
Is CVE-1999-0001 known to be exploited?: 20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.