CVE-2023-30088Public exploit

Interpreter crash via null-address write

Published May 9, 2023 · Updated Jan 29, 2025

Memory corruption in Cesanta MJS 1.26 allows local users to crash the interpreter by executing a crafted JavaScript file. In mjs_execute in mjs.c, the crafted input reaches line 9320 and triggers a write through a null address, producing an AddressSanitizer segmentation fault. Execution of the attacker-supplied file with low-privilege local access is required, and the demonstrated consequence is process termination rather than code execution.

CVSS severity5.5
Medium
EPSS probability0.26%
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 Cesanta MJS 1.26 allows local users to crash the interpreter by executing a crafted JavaScript file. In mjs_execute in mjs.c, the crafted input reaches line 9320 and triggers a write through a null address, producing an AddressSanitizer segmentation fault. Execution of the attacker-supplied file with low-privilege local access is required, and the demonstrated consequence is process termination rather than code execution.

The record

CVE
CVE-2023-30088
Published
May 9, 2023
Updated
Jan 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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 privilegesauthenticated

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:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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