CVE-1999-0063
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
Exploit likelihood
What each source reports
NVD Score used
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
- Record
CVE-1999-0063- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
CVE List No score
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
- Record
CVE-1999-0063- Updated
- 2026-11-02
EUVDEUVD-1999-0063 No score
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
- Record
EUVD-1999-0063- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-h9f6-v64j-cw96 No score
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
- Record
GHSA-h9f6-v64j-cw96- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Cisco IOS 12.0.2 - Syslog Crash | 1999-01-11 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-1999-0063 is a medium vulnerability (CVSS 5.0) in Cisco Ios, published January 11, 1999. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 8.25%, the 94th percentile. No source names a fixed version.