Security readout for executives and security teams
Plain-English summary
CVE-2019-15651 is a wolfSSL 4.1.0 certificate-parsing flaw. A specially crafted DER certificate can trigger a one-byte heap buffer over-read. The public record does not provide CVSS scoring, confirmed impact beyond over-read, or a named fixed version, so urgency depends on whether wolfSSL 4.1.0 is present in your environment.
Executive priority
Treat this as an exposure-confirmation task, not a confirmed emergency from the supplied evidence. If wolfSSL 4.1.0 is present in internet-facing or certificate-heavy systems, prioritize vendor follow-up and remediation tracking.
Technical view
The issue is in DecodeCertExtensions in wolfcrypt/src/asn.c. The CVE states ASN_BOOLEAN handling is incorrect for crafted DER certificates in GetLength_ex, causing a one-byte heap-based buffer over-read. The source bundle does not document code execution, denial of service, affected CPEs, or a vendor-confirmed remediation version.
Likely exposure
Exposure is most likely where applications, appliances, firmware, or services use wolfSSL 4.1.0 to parse DER certificates. The CVE data does not identify specific downstream products or CPEs, so dependency and vendor inventory are required.
Exploitation context
The source bundle does not show active exploitation, and the CVE is not listed as KEV. The described trigger is a crafted DER certificate processed by wolfSSL certificate parsing. No public exploit status or weaponized use is provided in the supplied sources.
Researcher notes
The record is sparse: no CVSS, CWE, CPE, patch version, or exploit confirmation is included. Analysis should stay anchored to the one-byte heap over-read in wolfSSL 4.1.0 DER certificate parsing and avoid assuming broader impact without vendor evidence.
Mitigation direction
- Identify direct and bundled use of wolfSSL 4.1.0.
- Check wolfSSL issue 2421 and vendor guidance for remediation details.
- Prioritize externally exposed certificate-parsing paths during triage.
- Ask device and software vendors whether they bundle affected wolfSSL code.
- Apply vendor-provided fixes when confirmed for affected deployments.
Validation and detection
- Generate a software inventory for wolfSSL dependencies and versions.
- Review SBOMs, package manifests, firmware notices, and vendor advisories.
- Confirm whether DER certificate parsing reaches wolfSSL 4.1.0 code.
- Track remediation evidence from vendors or maintainers.
- Document cases where wolfSSL is absent or unreachable.
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-2019-15651 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/issues/2421CVE 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.