CVE-2023-29570Public exploit

Interpreter crash via invalid FFI callback read

Published Apr 24, 2023 · Updated Feb 4, 2025

Segmentation fault in Cesanta mJS 2.20.0 allows context-dependent attackers to crash the interpreter by executing crafted JavaScript. The mjs_ffi_cb_free callback-cleanup routine dereferences an invalid address while processing the proof-of-concept script, causing an AddressSanitizer abort. Exploitation requires a user or embedding application to execute the crafted script locally; the demonstrated consequence is process termination.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Segmentation fault in Cesanta mJS 2.20.0 allows context-dependent attackers to crash the interpreter by executing crafted JavaScript. The mjs_ffi_cb_free callback-cleanup routine dereferences an invalid address while processing the proof-of-concept script, causing an AddressSanitizer abort. Exploitation requires a user or embedding application to execute the crafted script locally; the demonstrated consequence is process termination.

The record

CVE
CVE-2023-29570
Published
Apr 24, 2023
Updated
Feb 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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?

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

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application 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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