Cisco IOS up to 12.0.7 Telnet Daemon 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.
5.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Cisco IOS up to 12.0.7. The affected element is an unknown function of the component Telnet Daemon. Executing a manipulation can lead to denial of service. This vulnerability is tracked as CVE-2000-0268. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Cisco IOS up to 12.0.7 (Router Operating System). This vulnerability affects some unknown functionality of the component Telnet Daemon. The manipulation with an unknown input 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:

Cisco IOS 11.x and 12.x allows remote attackers to cause a denial of service by sending the ENVIRON option to the Telnet daemon before it is ready to accept it, which causes the system to reboot.

The bug was discovered 04/20/2000. The weakness was disclosed 04/20/2000 by Cisco with Network Associates as not defined advisory (Website). The advisory is shared for download at cisco.com. This vulnerability was named CVE-2000-0268. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 48948 (Cisco IOS Software TELNET Option Handling Vulnerability - Cisco Systems), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (4312), Tenable (48948), SecurityFocus (BID 1123†), OSVDB (1289†) and Vulnerability Center (SBV-11213†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 48948
Nessus Name: Cisco IOS Software TELNET Option Handling Vulnerability - Cisco Systems
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Timelineinfo

10/10/1999 🔍
04/20/2000 +193 days 🔍
04/20/2000 +0 days 🔍
04/20/2000 +0 days 🔍
04/20/2000 +0 days 🔍
04/20/2000 +0 days 🔍
02/21/2003 +1037 days 🔍
04/25/2006 +1158 days 🔍
09/01/2010 +1590 days 🔍
06/24/2014 +1392 days 🔍
04/21/2026 +4319 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco.com
Researcher: Cisco
Organization: Network Associates
Status: Confirmed

CVE: CVE-2000-0268 (🔍)
GCVE (CVE): GCVE-0-2000-0268
GCVE (VulDB): GCVE-100-15472
X-Force: 4312
SecurityFocus: 1123 - Cisco IOS Software TELNET Option Handling Vulnerability
OSVDB: 1289 - Cisco IOS Telnet ENVIRON Option Handling DoS
Vulnerability Center: 11213 - [cisco-sa-20000420-ios-telnet] Cisco IOS DoS via Telnet PORT Command, High

Entryinfo

Created: 06/24/2014 11:45
Updated: 04/21/2026 05:09
Changes: 06/24/2014 11:45 (75), 06/16/2019 18:05 (1), 04/21/2026 05:09 (18)
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!