Security readout for executives and security teams
Plain-English summary
CVE-2021-41959 describes a memory leak in JerryScript, a lightweight JavaScript engine. The provided record ties it to Git version 14ff5bf and RegExp handling. A memory leak can degrade availability over time, especially in constrained embedded environments, but the sources do not provide severity scoring or downstream product impact.
Executive priority
Treat this as a targeted component hygiene issue unless JerryScript is used in exposed or resource-constrained systems. Prioritize inventory first; urgency rises if the affected engine processes untrusted JavaScript or RegExp inputs in production.
Technical view
The CVE says JerryScript version 14ff5bf insufficiently tracks and releases allocated memory in jerry-core/ecma/operations/ecma-regexp-object.c after RegExp processing. The public references are a GitHub issue and pull request. No CVSS, CWE, affected CPEs, or named downstream products are provided in the bundle.
Likely exposure
Exposure is limited to environments compiling or embedding the affected JerryScript Git version, or downstream code that retained the same memory management flaw. The provided sources do not identify packaged releases, vendors, devices, or services that include it.
Exploitation context
The source bundle does not indicate active exploitation, and KEV is false. The described impact is memory leakage after RegExp handling, which is primarily an availability and resource-exhaustion concern rather than direct code execution based on available evidence.
Researcher notes
Evidence is sparse: the CVE record names a specific Git version and source file but provides no CVSS, CWE, CPEs, exploit status, or downstream advisories. Validate impact against actual embedded JerryScript code rather than assuming broad product exposure.
Mitigation direction
- Inventory JerryScript builds and vendored source for Git version 14ff5bf.
- Review JerryScript issue #4781 and pull request #4787 for maintainer remediation details.
- Update to a JerryScript revision containing the accepted maintainer fix, if applicable.
- Monitor memory use where untrusted RegExp input reaches JerryScript.
- Ask downstream vendors for guidance if JerryScript is embedded in supplied products.
Validation and detection
- Check SBOMs, source manifests, and firmware packages for JerryScript.
- Compare ecma-regexp-object.c against the maintainer change referenced in PR #4787.
- Review release or build metadata for commit 14ff5bf or nearby vulnerable code.
- Run regression tests that exercise RegExp creation and cleanup under memory monitoring.
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
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CVE-2021-41959 mapping review
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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/jerryscript-project/jerryscript/issues/4781CVE reference · x_refsource_MISC
- https://github.com/jerryscript-project/jerryscript/pull/4787CVE 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.