CVE-2024-35385Public exploitNetwork attack vector

Interpreter crash via malformed FFI signature

Published May 21, 2024 · Updated Feb 13, 2025

Out-of-bounds read in Cesanta mJS 2.20.0 allows remote authenticated users to crash the interpreter via crafted JavaScript. The mjs_mk_ffi_sig FFI-signature constructor reads through a null address while processing a malformed ffi() signature, producing a segmentation fault. Reachability requires the ability to execute crafted code with FFI access; successful exploitation interrupts only the hosting process.

CVSS severity4.3
Medium
EPSS probability0.53%
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 Cesanta mJS 2.20.0 allows remote authenticated users to crash the interpreter via crafted JavaScript. The mjs_mk_ffi_sig FFI-signature constructor reads through a null address while processing a malformed ffi() signature, producing a segmentation fault. Reachability requires the ability to execute crafted code with FFI access; successful exploitation interrupts only the hosting process.

The record

CVE
CVE-2024-35385
Published
May 21, 2024
Updated
Feb 13, 2025
Vendor
Cesanta
Product
mJS
Classifications
CWE-125, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 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 privilegesauthenticated

What is affected?

Cesanta · mJSversion=2.20.0

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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