An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97.
Priority MEDIUM 51CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-770.
Summary
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers mishandle the early use of a large epoch number. This vulnerability allows remote attackers to cause a denial of service and false-positive packet drops.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00989 62nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:contiki-ng:tinydtls:*:*:*:*:*:*:*:* | up to 2018-08-30 | Vulnerable | contiki-ng |
- cpe:2.3:a:contiki-ng:tinydtls:*:*:*:*:*:*:*:* Versions up to 2018-08-30 Vulnerable ·contiki-ng
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42142
- 2026-10-03 Alias added: GHSA-q37p-g696-qhwm
References
More contiki-ng Tinydtls vulnerabilities
- TI-2021-18654 Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS… CVSS 3.1CRITICAL 9.1
- TI-2021-18648 An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. CVSS 3.1CRITICAL 9.8
- TI-2021-18650 An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. CVSS 3.1CRITICAL 9.1
- TI-2021-18653 An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. CVSS 3.1HIGH 7.5
- TI-2021-18652 An assertion failure discovered in in check_certificate_request() in Contiki-NG tinyDTLS… CVSS 3.1HIGH 7.5
Sources
- CVE-2021-42142 · CVE Program
- CVE-2021-42142 · NVD
- FIRST EPSS
- GHSA-q37p-g696-qhwm · GitHub Advisory Database · CC BY 4.0
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