CVE-2021-38311: contiki-os contiki Infinite Loop
Vulnerability summary
CVE-2021-38311 is a high (CVSS 7.5) Infinite Loop vulnerability in contiki-os contiki. EPSS estimates a 0.94% chance of exploitation in the next 30 days, higher than 60.6% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 09-08-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
0.94%
Chance of exploitation in the next 30 days
Percentile
61%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.94% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundContiki
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Contiki-os1 product
- contiki3.0
1 vendor · 1 product
References
1 links- github.com/contiki-os/contiki/issues/2685X Refsource MISCExploitIssue TrackingPatchThird Party Advisory