Security readout for executives and security teams
Plain-English summary
CVE-2021-44718 is a denial-of-service issue in wolfSSL client code through version 5.0.0. A network attacker in a machine-in-the-middle position could send crafted TLS traffic that makes the client enter an infinite loop. The sources do not indicate data theft, code execution, or known active exploitation.
Executive priority
Treat this as a targeted availability risk, not an emergency based on current evidence. Prioritize internet-facing, remote-site, embedded, or operational systems where TLS client downtime would disrupt service and where wolfSSL version visibility is weak.
Technical view
The flaw is in wolfSSL client handling of TLS messages. The client module accepts message types normally intended for TLS servers, allowing crafted MITM traffic to trigger an infinite loop and denial of service in affected client components through 5.0.0.
Likely exposure
Exposure is most likely in applications, appliances, or embedded products using wolfSSL as a TLS client at version 5.0.0 or earlier. Risk depends on whether an attacker can intercept or modify the client’s TLS traffic path.
Exploitation context
The CVE description requires a machine-in-the-middle position and crafted traffic. CISA KEV is false in the supplied bundle, and no cited source reports active exploitation. Public evidence provided is limited to the CVE description and vendor reference pages.
Researcher notes
Affected product metadata in the bundle is incomplete, but the description names wolfSSL through 5.0.0. No CVSS, CWE, fixed version, or exploit confirmation is provided. The moderate rating is an analyst judgment based on DoS impact and MITM prerequisite.
Mitigation direction
- Inventory software and firmware that embeds wolfSSL client code.
- Identify wolfSSL versions and prioritize 5.0.0 or earlier for review.
- Check wolfSSL security advisories and releases for fixed-version guidance.
- Update affected deployments according to vendor or product maintainer instructions.
- Reduce opportunities for network interception where affected clients operate.
Validation and detection
- Confirm whether the product uses wolfSSL as a TLS client library.
- Record the exact wolfSSL version in each affected application or firmware image.
- Review vendor release notes for CVE-2021-44718 remediation status.
- Verify upgraded builds no longer include wolfSSL 5.0.0 or earlier.
- Assess whether attacker-controlled network paths exist for affected clients.
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-2021-44718 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://www.wolfssl.com/docs/security-vulnerabilities/CVE reference · x_refsource_MISC
- https://github.com/wolfSSL/wolfssl/releasesCVE 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.