CVE-2024-35386Public exploitNetwork attack vector

Interpreter crash via garbage-collector null dereference

Published May 21, 2024 · Updated Mar 13, 2025

Denial of service in Cesanta mJS 2.20.0 allows remote attackers to crash the interpreter by supplying crafted JavaScript code. The crafted expression reaches mjs_do_gc with an invalid interpreter pointer, where a state read dereferences address zero and raises SIGSEGV. Exploitation requires a host application to evaluate attacker-controlled mJS code; the demonstrated consequence is process termination, not data access or code execution.

CVSS severity7.5
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cesanta mJS 2.20.0 allows remote attackers to crash the interpreter by supplying crafted JavaScript code. The crafted expression reaches mjs_do_gc with an invalid interpreter pointer, where a state read dereferences address zero and raises SIGSEGV. Exploitation requires a host application to evaluate attacker-controlled mJS code; the demonstrated consequence is process termination, not data access or code execution.

The record

CVE
CVE-2024-35386
Published
May 21, 2024
Updated
Mar 13, 2025
Vendor
Cesanta
Product
mJS
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2025Record 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=2.20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cesanta · mJSversion=2.20.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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