Security readout for executives and security teams
Plain-English summary
wolfSSL versions 4.6.x through 4.7.x could accept an OCSP response even when its certificate serial number did not match the request. OCSP helps confirm certificate revocation status, so this is a trust-checking flaw. The provided sources do not state severity, real-world exploitation, or affected downstream products.
Executive priority
Treat this as a targeted dependency remediation item, not an emergency based on the provided evidence. Prioritize systems where wolfSSL performs certificate revocation checks for external connections or sensitive trust decisions.
Technical view
CVE-2021-37155 affects wolfSSL 4.6.x through 4.7.x before 4.8.0. The issue is incorrect OCSP validation: a serial number mismatch between the OCSP request and response does not produce a failure outcome. This may weaken certificate status validation where applications rely on wolfSSL OCSP handling.
Likely exposure
Exposure is most likely in products, firmware, services, or applications embedding wolfSSL 4.6.x or 4.7.x and using OCSP validation. The source bundle does not identify specific downstream vendors, packages, platforms, or deployment conditions.
Exploitation context
The source bundle does not show active exploitation, public weaponization, or KEV listing. Practical risk depends on whether OCSP checking is enabled and whether an attacker can influence certificate status validation paths.
Researcher notes
Evidence is limited to the CVE description and wolfSSL references. No CVSS, CWE, exploit status, or downstream product list is provided. The central validation point is whether OCSP serial-number mismatches fail correctly after upgrade or vendor remediation.
Mitigation direction
- Inventory applications, appliances, firmware, and containers that embed wolfSSL.
- Upgrade affected wolfSSL deployments to 4.8.0 or later where supported.
- Check wolfSSL and supplier guidance for product-specific fixes or backports.
- Request SBOM or component version confirmation from vendors using wolfSSL.
- Prioritize internet-facing and high-trust certificate validation environments.
Validation and detection
- Confirm deployed wolfSSL versions are not 4.6.x or 4.7.x.
- Review SBOMs, build manifests, and vendor advisories for wolfSSL usage.
- Verify upgraded builds link against wolfSSL 4.8.0 or later.
- Test OCSP validation rejects mismatched serial numbers.
- Document whether OCSP validation is enabled in relevant applications.
Public sources used
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.
CVE-2021-37155 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/wolfSSL/wolfssl/pull/3990CVE reference · x_refsource_MISC
- https://github.com/wolfSSL/wolfssl/releases/tag/v4.8.0-stableCVE reference · x_refsource_MISC
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.