CVE-2021-40523 Information

Description

In Contiki 3.0 Telnet option negotiation is mishandled. During negotiation between a server and a client the server may fail to give the WILL/WONT or DO/DONT response for DO and WILL commands because of improper handling of exception condition which leads to property violations and denial of service. Specifically a server sometimes sends no response because a fixed buffer space is available for all responses and that space may have been exhausted.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://github.com/contiki-os/contiki/issues/2686

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5