CVE-2024-33255Public exploit

Process abort via malformed class and destructuring syntax

Published Apr 26, 2024 · Updated Aug 2, 2024

Reachable assertion in JerryScript commit cefd391 allows local users to abort an embedding process with crafted JavaScript source. During error cleanup, ecma_free_string_list requires every queued string to have a reference count of one and terminates when malformed class and destructuring syntax violates that invariant. Execution of attacker-supplied JavaScript in an assertion-enabled build is required, and the demonstrated consequence is process termination.

CVSS severity6.2
Medium
EPSS probability0.27%
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 commit cefd391 allows local users to abort an embedding process with crafted JavaScript source. During error cleanup, ecma_free_string_list requires every queued string to have a reference count of one and terminates when malformed class and destructuring syntax violates that invariant. Execution of attacker-supplied JavaScript in an assertion-enabled build is required, and the demonstrated consequence is process termination.

The record

CVE
CVE-2024-33255
Published
Apr 26, 2024
Updated
Aug 2, 2024
Vendor
JerryScript Project
Product
JerryScript
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=cefd391

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JerryScript Project · JerryScriptversion=cefd391

Published CVSS scores

6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/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
T1499.004Application or System Exploitation

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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