Security readout for executives and security teams
Plain-English summary
wolfSSL before 5.6.6 could accept TLS or DTLS messages that cross cryptographic key boundaries. In a narrow TLS 1.3 case, a client could accept an unencrypted server flight after ServerHello. Sources state this does not compromise key negotiation or authentication, so business urgency is limited.
Executive priority
Handle through normal patch management, not emergency response. Prioritize internet-facing or security-sensitive systems using wolfSSL, but current sources do not support active exploitation or severe business impact.
Technical view
The flaw is improper input validation in wolfSSL record handling. Messages using different keys could be combined in one TLS or DTLS record, violating expected key-boundary enforcement. CVSS is 5.3 with network attack vector and low confidentiality impact only.
Likely exposure
Exposure is limited to systems, applications, or embedded products using wolfSSL prior to 5.6.6. The source bundle does not identify specific downstream products, configurations, or deployments beyond wolfSSL itself.
Exploitation context
No active exploitation is cited, and the CVE is not listed as KEV in the provided bundle. The issue is remotely reachable by CVSS, but published impact is limited to low confidentiality exposure without integrity or availability impact.
Researcher notes
Focus validation on wolfSSL record parsing around TLS and DTLS key transitions, especially TLS 1.3 client handling after ServerHello. Evidence supports boundary-enforcement failure, but not authentication bypass, key compromise, or a named exploit path.
Mitigation direction
- Identify applications and firmware that bundle wolfSSL.
- Upgrade wolfSSL to 5.6.6 or later where applicable.
- Review wolfSSL's advisory and patch reference for vendor guidance.
- Request downstream vendor confirmation for products that embed wolfSSL.
Validation and detection
- Inventory wolfSSL versions in source, packages, containers, and firmware SBOMs.
- Confirm no deployed component uses wolfSSL before 5.6.6.
- Check vendor advisories for downstream products using bundled wolfSSL.
- Document compensating controls if immediate upgrade is unavailable.
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
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ATT&CK lookup starting points
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-6937 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
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/wolfSSL/wolfssl/pull/7029CVE reference · patch
- https://www.wolfssl.com/docs/security-vulnerabilities/CVE reference · vendor-advisory
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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.