CVE-2023-49552Public exploitNetwork attack vector

Service crash via JSON stringification stack overflow

Published Jan 2, 2024 · Updated Apr 17, 2025

Out-of-bounds write in Cesanta mJS 2.20.0 allows remote attackers to crash the engine through crafted JSON stringification input. Executing the supplied proof-of-concept script causes mjs_op_json_stringify to exhaust the process stack, with AddressSanitizer locating the abort at mjs.c line 11362. No authentication or user interaction is required in a network-exposed embedding, and exploitation interrupts the process without reported data disclosure or code execution.

CVSS severity7.5
High
EPSS probability0.76%
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 write in Cesanta mJS 2.20.0 allows remote attackers to crash the engine through crafted JSON stringification input. Executing the supplied proof-of-concept script causes mjs_op_json_stringify to exhaust the process stack, with AddressSanitizer locating the abort at mjs.c line 11362. No authentication or user interaction is required in a network-exposed embedding, and exploitation interrupts the process without reported data disclosure or code execution.

The record

CVE
CVE-2023-49552
Published
Jan 2, 2024
Updated
Apr 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-787Out-of-bounds Write
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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