CVE-2023-32722Network attack vector

Service crash via JSON parser stack overflow

Published Oct 12, 2023 · Updated Nov 3, 2025

Buffer overflow in zbxjson in Zabbix 6.4.4 allows remote attackers to cause service interruption via crafted JSON input. The zbx_json_open parser copies oversized JSON content into a stack buffer without adequate bounds checking, producing a stack-based overflow in Agent, Proxy, and Server components. Exploitation requires delivery of the crafted JSON to a parsing path and can crash the process; the advisory does not document a working code-execution exploit.

CVSS severity9.6
Critical
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in zbxjson in Zabbix 6.4.4 allows remote attackers to cause service interruption via crafted JSON input. The zbx_json_open parser copies oversized JSON content into a stack buffer without adequate bounds checking, producing a stack-based overflow in Agent, Proxy, and Server components. Exploitation requires delivery of the crafted JSON to a parsing path and can crash the process; the advisory does not document a working code-execution exploit.

The record

CVE
CVE-2023-32722
Published
Oct 12, 2023
Updated
Nov 3, 2025
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-787, CWE-120, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 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=6.0.0 <=6.0.20
  2. Affected versionversion=6.0.0 <=6.0.20 changes=[{"at":"6.0.21rc1","status":"unaffected"}]
  3. Affected versionversion=6.4.0 <=6.4.5
  4. Affected versionversion=6.4.0 <=6.4.5 changes=[{"at":"6.4.6rc1","status":"unaffected"}]
  5. Affected versionversion=7.0.0
  6. Affected versionversion=7.0.0alpha1 <=7.0.0alpha3 changes=[{"at":"7.0.0alpha4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zabbix · Zabbixversion=6.0.0 <=6.0.20; version=6.0.0 <=6.0.20 changes=[{"at":"6.0.21rc1","status":"unaffected"}]; version=6.4.0 <=6.4.5; version=6.4.0 <=6.4.5 changes=[{"at":"6.4.6rc1","status":"unaffected"}]; version=7.0.0; version=7.0.0alpha1 <=7.0.0alpha3 changes=[{"at":"7.0.0alpha4","status":"unaffected"}]

Published CVSS scores

9.6ZabbixCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1210Exploitation of Remote Services

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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