An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97.
Priority MEDIUM 40CWE-303Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00662 51st 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
- Partial
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:2018-08-30:*:*:*:*:*:*:* | 2018-08-30 | Vulnerable | contiki-ng |
- cpe:2.3:a:contiki-ng:tinydtls:2018-08-30:*:*:*:*:*:*:* Versions 2018-08-30 Vulnerable ·contiki-ng
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42146
- 2026-10-03 Alias added: GHSA-wmpm-9r6p-rpww
- 2026-10-07 EPSS moved to the 50th–90th percentile
References
More contiki-ng Tinydtls vulnerabilities
- TI-2021-18649 An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. CVSS 3.1CRITICAL 9.8
- 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-2021-18652 An assertion failure discovered in in check_certificate_request() in Contiki-NG tinyDTLS… CVSS 3.1HIGH 7.5
Sources
- CVE-2021-42146 · CVE Program
- CVE-2021-42146 · NVD
- FIRST EPSS
- GHSA-wmpm-9r6p-rpww · GitHub Advisory Database · CC BY 4.0
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