Vulnerability in Cisco iOS

CVE-1999-0157

Cisco PIX firewall and CBAC IP fragmentation attack results in a denial of service.

Published 1998-08-18 · 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: 0.011 (64.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: -0.000

Affected products

Cisco iOS — versions 11.2p, 11.3t, 12.0
Cisco Pix Firewall Software — versions 4.2(1), 4.2\(1\)

References

www.osvdb.org/1097 (vdb-entry)