CVE-2024-33258Public exploit

Engine crash via static-block semicolon parsing

Published Apr 26, 2024 · Updated Aug 6, 2024

Memory corruption in JerryScript commit ff9ff8f allows local users to crash the engine by executing a crafted JavaScript file. The class-body scanner handles a semicolon after a static block only after identifier validation, leaving inconsistent parser state that reaches a near-null write in vm_loop. Execution of attacker-controlled JavaScript is required; release builds segfault, while debug builds abort on a parser assertion.

CVSS severity7.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in JerryScript commit ff9ff8f allows local users to crash the engine by executing a crafted JavaScript file. The class-body scanner handles a semicolon after a static block only after identifier validation, leaving inconsistent parser state that reaches a near-null write in vm_loop. Execution of attacker-controlled JavaScript is required; release builds segfault, while debug builds abort on a parser assertion.

The record

CVE
CVE-2024-33258
Published
Apr 26, 2024
Updated
Aug 6, 2024
Vendor
JerryScript Project
Product
JerryScript
Classifications
CWE-119, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=ff9ff8f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JerryScript Project · JerryScriptversion=ff9ff8f

Published CVSS scores

7.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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