CVE-2021-40523
Last modified
CVE-2021-40523 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.93% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Contiki-Os | Contiki | 3.0 |
References
- https://github.com/contiki-os/contiki/issues/2686Patch, Third Party Advisory
- https://github.com/contiki-os/contiki/issues/2686Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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