CVE-1999-0193

Exp

Denial of service in Ascend and 3com routers, which can be rebooted by sending a zero length TCP option.

Published: 1997-12-01 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0193 is rated High Exploit Risk (66.1/100): CVSS Medium severity, with high exploitation likelihood (EPSS 4.89%, 91th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-1999-0193

EDB-ID Source Kind Published Link
20332 exploit_db edb 1998-03-17 Exploit-DB ↗
20331 exploit_db edb 1998-03-16 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-1999-0193

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.61% 4.89% -0.72%
2 2025-09-10 4.97% 5.61% +0.64%
3 2025-03-17 — 4.97% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0193

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-1999-0193

OS Trackers for CVE-1999-0193

vendor priority summary link
alpine — CVE-1999-0193: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-1999-0193

Affected software / configurations for CVE-1999-0193

Vendor Product Version Raw CPE
ascend cascadeview_ux 1.0 cpe:2.3:a:ascend:cascadeview_ux:1.0:*:*:*:*:*:*:*

References for CVE-1999-0193

cvelogic Threat Intelligence