CVE-2023-30187Public exploitNetwork attack vector

Remote code execution via exposed native buffer primitives

Published Aug 14, 2023 · Updated Jul 9, 2026

Out-of-bounds memory access in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows remote attackers to execute code via crafted JavaScript. The doctrenderer V8 bridge exposes Save_AllocNative and Save_ReAllocNative to untrusted scripts, allowing attacker-controlled lengths and positions to drive native save-buffer operations beyond valid memory bounds. The server must process the crafted file through its document-conversion path; successful exploitation runs code in the DocumentServer process context.

CVSS severity9.8
Critical
EPSS probability2.36%
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 memory access in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows remote attackers to execute code via crafted JavaScript. The doctrenderer V8 bridge exposes Save_AllocNative and Save_ReAllocNative to untrusted scripts, allowing attacker-controlled lengths and positions to drive native save-buffer operations beyond valid memory bounds. The server must process the crafted file through its document-conversion path; successful exploitation runs code in the DocumentServer process context.

The record

CVE
CVE-2023-30187
Published
Aug 14, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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