CVE-2023-29458Network attack vector

JavaScript crash via valstack limit mishandling

Published Jul 13, 2023 · Updated Nov 3, 2025

Improper array-index validation in affected Zabbix Server and Proxy releases allows remote authenticated users to crash JavaScript processing. Duktape 2.6 call setup mishandles the value-stack size limit, allowing excessive values to reach memory-unsafe behavior instead of failing safely. Low-privileged access capable of submitting JavaScript for Server or Proxy processing is required, and successful exploitation interrupts processing with limited integrity impact.

CVSS severity5.9
Medium
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

Improper array-index validation in affected Zabbix Server and Proxy releases allows remote authenticated users to crash JavaScript processing. Duktape 2.6 call setup mishandles the value-stack size limit, allowing excessive values to reach memory-unsafe behavior instead of failing safely. Low-privileged access capable of submitting JavaScript for Server or Proxy processing is required, and successful exploitation interrupts processing with limited integrity impact.

The record

CVE
CVE-2023-29458
Published
Jul 13, 2023
Updated
Nov 3, 2025
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-129, CWE-129, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5,0,0 <=5.0.34 changes=[{"at":"5.0.35rc1","status":"unaffected"}]
  2. Affected versionversion=6,0,0 <=6.0.17 changes=[{"at":"6.0.18rc1","status":"unaffected"}]
  3. Affected versionversion=6.4.0 <=6.4.2 changes=[{"at":"6.4.3rc1","status":"unaffected"}]
  4. Affected versionversion=7.0.0alpha1 <=7.0.0alpha1 changes=[{"at":"7.0.0alpha1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=5,0,0 <=5.0.34 changes=[{"at":"5.0.35rc1","status":"unaffected"}]; version=6,0,0 <=6.0.17 changes=[{"at":"6.0.18rc1","status":"unaffected"}]; version=6.4.0 <=6.4.2 changes=[{"at":"6.4.3rc1","status":"unaffected"}]; version=7.0.0alpha1 <=7.0.0alpha1 changes=[{"at":"7.0.0alpha1","status":"unaffected"}]

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9ZabbixCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
CWE-129Improper Validation of Array Index
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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