CVE-2021-46474Public exploit

Interpreter crash via out-of-bounds heap read

Published Jan 25, 2022 · Updated Aug 4, 2024

Out-of-bounds read in Jsish 3.5.0 allows local users to crash the interpreter by executing a crafted JavaScript file. In jsiEvalCodeSub in src/jsiEval.c, evaluation of a strict-mode function that assigns to eval reads eight bytes before an allocated heap buffer. Execution of attacker-controlled JavaScript and user interaction are required; the demonstrated consequence is interpreter termination, not code execution.

CVSS severity5.5
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Jsish 3.5.0 allows local users to crash the interpreter by executing a crafted JavaScript file. In jsiEvalCodeSub in src/jsiEval.c, evaluation of a strict-mode function that assigns to eval reads eight bytes before an allocated heap buffer. Execution of attacker-controlled JavaScript and user interaction are required; the demonstrated consequence is interpreter termination, not code execution.

The record

CVE
CVE-2021-46474
Published
Jan 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 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 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-787Out-of-bounds Write

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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