CVE-2023-27728Public exploit

Interpreter crash via recursive object dumping

Published Apr 9, 2023 · Updated Feb 11, 2025

Out-of-bounds read in NGINX njs 0.7.10 allows local users to crash the command-line interpreter via a crafted JavaScript object. While dumping an array, njs_dump_is_recursive follows an enumerable getter whose value is Object and dereferences an invalid address. Triggering requires execution of attacker-controlled JavaScript; upstream treats such scripts as trusted configuration and classifies related memory faults as ordinary bugs.

CVSS severity7.5
High
EPSS probability0.74%
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 NGINX njs 0.7.10 allows local users to crash the command-line interpreter via a crafted JavaScript object. While dumping an array, njs_dump_is_recursive follows an enumerable getter whose value is Object and dereferences an invalid address. Triggering requires execution of attacker-controlled JavaScript; upstream treats such scripts as trusted configuration and classifies related memory faults as ordinary bugs.

The record

CVE
CVE-2023-27728
Published
Apr 9, 2023
Updated
Feb 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 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 privilegesUnavailable in this record.

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
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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