VULNERABILITY INTELLIGENCE

CVE-2021-38311

CVSS score7.5 HIGH
EPSS probability0.94%
CISA KEVNot currently listed
Published2021-08-09
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Weakness classification

  • nvd@nist.gov: CWE-835

Primary references