Vulnerability in Contiki-Os Contiki
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.
EPSS: 0.010 (59.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Contiki-os Contiki — versions 3.0
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-40523?
- CVE-2021-40523 is a high-severity vulnerability in Contiki-Os Contiki, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2021-09-05.
- How severe is CVE-2021-40523?
- High severity. CVSS v3 base score is 7.5 out of 10.