CVE-2021-41682Public exploit

Invalid memory read via stale for-in index

Published Jun 20, 2022 · Updated Aug 4, 2024

Heap use-after-free in JerryScript 2.4.0 allows local users to trigger an invalid read by executing crafted JavaScript during typed-array sorting. In vm_loop, an abrupt Proxy has result enters cleanup without saving the current for-in collection index, so cleanup releases a string that later property lookup compares. Execution of attacker-controlled JavaScript is required; the public test produces an AddressSanitizer abort, while code execution is not demonstrated.

CVSS severity7.8
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap use-after-free in JerryScript 2.4.0 allows local users to trigger an invalid read by executing crafted JavaScript during typed-array sorting. In vm_loop, an abrupt Proxy has result enters cleanup without saving the current for-in collection index, so cleanup releases a string that later property lookup compares. Execution of attacker-controlled JavaScript is required; the public test produces an AddressSanitizer abort, while code execution is not demonstrated.

The record

CVE
CVE-2021-41682
Published
Jun 20, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 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

6.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 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-416Use After Free

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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