CVE-2021-38311
HIGHContiki 3.0 - Denial of Service via Telnet Option Negotiation Loop
Title source: llmDescription
In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service. When the negotiated options are already disabled, servers still respond to DONT and WONT requests with WONT or DONT commands, which may lead to infinite acknowledgment loops, denial of service, and excessive CPU consumption.
References (1)
Core 1
Core References
Exploit, Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://github.com/contiki-os/contiki/issues/2685
Scores
CVSS v3
7.5
EPSS
0.0094
EPSS Percentile
56.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-835
Status
published
Products (1)
contiki-os/contiki
3.0
Published
Aug 09, 2021
Tracked Since
Feb 18, 2026