CVEvulnerability

CVE-2021-40523

7.5 HIGH Published 2021-09-05 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-09-05
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Weaknesses
CWE-754

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.

Affected configurations

• contiki-os contiki 3.0

Related

Weakness · CWE (1)

  • CWE-754 Improper Check for Unusual or Exceptional Conditions weakness

References