CVE-2021-38387

7.5 highEPSS 1.0%

High (7.5) in contiki-os contiki. EPSS 1.0% chance of exploitation in the next 30 days.

In Contiki 3.0, a Telnet server that silently quits (before disconnection with clients) leads to connected clients entering an infinite loop and waiting forever, which may cause excessive CPU consumption.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 1.0% chance of exploitation in the next 30 days; higher than 61% of CVEs (scores of 2026-10-31)
CWE: CWE-835
Published: 2021-08-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

contiki-os:contiki

References

https://github.com/contiki-os/contiki/issues/2688
https://github.com/contiki-os/contiki/issues/2688

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