CVE-1999-0063

Name: CVE-1999-0063
Creator: NVD / NIST
Published: 1999-01-11T05:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 8.25%

Last modified Jun 16, 2026

CVE-1999-0063 is a vulnerability of currently unknown severity. Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.. EPSS estimates a 8.25% chance of exploitation in the next 30 days.

Description

Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.

Metrics

EPSS Probability

8.25%

94.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Cisco	Ios	11.3aa
Cisco	Ios	11.3db
Cisco	Ios	12.0
Cisco	Ios	12.0\(1\)w
Cisco	Ios	12.0\(1\)xa3
Cisco	Ios	12.0\(1\)xb
Cisco	Ios	12.0\(1\)xe
Cisco	Ios	12.0\(2\)xc
Cisco	Ios	12.0\(2\)xd
Cisco	Ios	12.0db
Cisco	Ios	12.0s
Cisco	Ios	12.0t

References

Timeline

Published: Jan 11, 1999
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-1999-0063?

Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.

How severe is CVE-1999-0063?

Severity scoring for CVE-1999-0063 is pending analysis. The EPSS model estimates a 8.25% probability of exploitation in the next 30 days.

How do I fix CVE-1999-0063?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-1999-0063?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST