3com Router TCP Options Zero Length denial of service

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.7$0-$5k0.00

Summaryinfo

A vulnerability was found in 3com Router and classified as problematic. The impacted element is an unknown function of the component TCP Options Handler. Executing a manipulation as part of Zero Length can lead to denial of service. This vulnerability is tracked as CVE-1999-0193. Moreover, an exploit is present. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability classified as problematic was found in 3com Router (Router Operating System) (the affected version is unknown). This vulnerability affects an unknown code of the component TCP Options Handler. The manipulation as part of a Zero Length leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

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

The weakness was disclosed 12/01/1997. This vulnerability was named CVE-1999-0193. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

Proper firewalling of is able to address this issue.

The vulnerability is also documented in the vulnerability database at Exploit-DB (20331). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.7

VulDB Base Score: 5.3
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/01/1997 🔍
12/01/1997 +0 days 🔍
06/18/2014 +6043 days 🔍
04/17/2026 +4321 days 🔍

Sourcesinfo

Vendor: 3com.com

Status: Not defined

CVE: CVE-1999-0193 (🔍)
GCVE (CVE): GCVE-0-1999-0193
GCVE (VulDB): GCVE-100-14032
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/18/2014 17:34
Updated: 04/17/2026 04:20
Changes: 06/18/2014 17:34 (35), 04/03/2019 17:29 (10), 08/02/2024 11:25 (25), 04/17/2026 04:20 (3)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!