Vulnerability Details CVE-2021-40523
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 55.7%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
Products affected by CVE-2021-40523
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cpe:2.3:o:contiki-os:contiki:3.0