CVE-2021-46349Public exploit

Interpreter abort via missing object-type handling

Published Jan 20, 2022 · Updated Aug 4, 2024

Reachable assertion in ecma_object_get_class_name in JerryScript 3.0.0 allows attackers to abort the interpreter using crafted JavaScript. The function accepts only general or proxy object types, but a crafted class-expression array assignment reaches it with another object type and trips the assertion. Execution requires a user to run attacker-controlled script locally; exploitation terminates the affected interpreter process without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.62%
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 ecma_object_get_class_name in JerryScript 3.0.0 allows attackers to abort the interpreter using crafted JavaScript. The function accepts only general or proxy object types, but a crafted class-expression array assignment reaches it with another object type and trips the assertion. Execution requires a user to run attacker-controlled script locally; exploitation terminates the affected interpreter process without reported data disclosure or modification.

The record

CVE
CVE-2021-46349
Published
Jan 20, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1203
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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1203Exploitation for Client Execution

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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