CVE-1999-0193
Denial of service in Ascend and 3com routers, which can be rebooted by sending a zero length TCP option.
- 5.0MediumCVSS base score
- 4.9%Exploitation in 30 daysEPSS · top 7.8% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 2Public exploitsMetasploit, Nuclei and Exploit-DB
Description
Denial of service in Ascend and 3com routers, which can be rebooted by sending a zero length TCP option.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list 2 Exploit-DB entries for it.
Show the exploits2
Exploit-DB2 entries
- Ascend R 4.5 Ci12 - Denial of Service (Exploit-DB entry) (opens in a new tab)
EDB-ID 20332dos, hardwarepublished 17 Mar 1998Verified
- Ascend R 4.5 Ci12 - Denial of Service (Exploit-DB entry) (opens in a new tab)
EDB-ID 20331dos, hardwarepublished 16 Mar 1998Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
- 8 months later
· 8 months later
Published
- 25 years later
· 25 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
- EPSS (exploitation in 30 days)
- 4.9% · top 7.8% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Affected products
n/a
- affected n/a
References
References1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0193 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-1999-0193 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-1999-0193)Record last updated .