Security readout for executives and security teams
This vulnerability affects Contiki-NG tinyDTLS handling of DTLS ClientHello messages. A remote, unauthenticated attacker can send malformed handshake traffic that may exhaust resources and potentially expose sensitive memory. For organizations using embedded or IoT software built on this library, the main business risk is service outage with possible confidentiality impact. Exposure is most likely in embedded, IoT, or constrained-device products that include Contiki-NG tinyDTLS from the affected code lineage. The CVE source bundle does not provide precise vendor, product, package, or release-version mappings, so asset inventory and supplier confirmation are necessary. Treat as urgent for any product or environment using Contiki-NG tinyDTLS, especially exposed IoT or embedded services. The CVSS score and unauthenticated network reachability justify rapid inventory and supplier follow-up, but remediation specifics depend on vendor guidance not included in the source bundle. Mitigation focus: Identify products and firmware that embed Contiki-NG tinyDTLS.; Check Contiki-NG and supplier guidance for fixed versions or patches.; Prioritize updates for internet-facing or unauthenticated DTLS services..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-835: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-42143 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H3.95.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://seclists.org/fulldisclosure/2024/Jan/16CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Loop with Unreachable Exit Condition ('Infinite Loop')
Loop with Unreachable Exit Condition ('Infinite Loop') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.