CVE-2021-46337Public exploit

Engine abort via reused private-identifier literal

Published Jan 20, 2022 · Updated Aug 4, 2024

Reachable assertion in JerryScript 3.0.0 allows context-dependent attackers to crash the engine by supplying crafted JavaScript. During private-identifier resolution, the parser reuses a literal object instead of constructing a new one, causing parser_list_get to exhaust its page list and fail the page_p != NULL assertion. Execution of the crafted script is required, and a successful trigger aborts the JerryScript process without reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in JerryScript 3.0.0 allows context-dependent attackers to crash the engine by supplying crafted JavaScript. During private-identifier resolution, the parser reuses a literal object instead of constructing a new one, causing parser_list_get to exhaust its page list and fail the page_p != NULL assertion. Execution of the crafted script is required, and a successful trigger aborts the JerryScript process without reported confidentiality or integrity impact.

The record

CVE
CVE-2021-46337
Published
Jan 20, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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