CVE-2024-43357

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 25% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.6Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

ECMA-262 is the language specification for the scripting language ECMAScript. A problem in the ECMAScript (JavaScript) specification of async generators, introduced by a May 2021 spec refactor, may lead to mis-implementation in a way that could present as a security vulnerability, such as type confusion and pointer dereference.

The internal async generator machinery calls regular promise resolver functions on IteratorResult ({ done, value }) objects that it creates, assuming that the IteratorResult objects will not be then-ables. Unfortunately, these IteratorResult objects inherit from Object.prototype, so these IteratorResult objects can be made then-able, triggering arbitrary behaviour, including re-entering the async generator machinery in a way that violates some internal invariants.

The ECMAScript specification is a living standard and the issue has been addressed at the time of this advisory's public disclosure. JavaScript engine implementors should refer to the latest specification and update their implementations to comply with the AsyncGenerator section.

References

  • https://github.com/tc39/ecma262/commit/1e24a286d0a327d08e1154926b3ee79820232727
  • https://bugzilla.mozilla.org/show_bug.cgi?id=1901411
  • https://github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq
  • https://bugs.webkit.org/show_bug.cgi?id=275407
  • https://issues.chromium.org/issues/346692561
  • https://www.cve.org/CVERecord?id=CVE-2024-7652

CVSS v3
8.6
EG Score
8.6(medium)
EPSS
44.6%
KEV
Not listed

Published

August 15, 2024

Last Modified

April 15, 2026

References (10)

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:26 UTCEPSS rescore
  2. 2026-07-11 02:52 UTCOSV refresh
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  1. 2026-06-22 14:25 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2024-43357?
CVE-2024-43357 is a high vulnerability published on August 15, 2024. ECMA-262 is the language specification for the scripting language ECMAScript. A problem in the ECMAScript (JavaScript) specification of async generators, introduced by a May 2021 spec refactor, may lead to mis-implementation in a way that could present as a security vulnerability, such as type…
When was CVE-2024-43357 disclosed?
CVE-2024-43357 was first published in the National Vulnerability Database on August 15, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-43357 actively exploited?
CVE-2024-43357 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-43357?
CVE-2024-43357 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2024-43357?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-43357, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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