CVE-2023-32726Network attack vector

Data exposure via unchecked DNS response length

Published Dec 18, 2023 · Updated Nov 3, 2025

Buffer over-read in the Zabbix Agent allows remote authenticated users to expose data, crash the agent, or execute code via a DNS response. The Agent DNS-response parser fails to verify that RDLENGTH remains within the received buffer before reading record data. Exploitation requires high privileges, user interaction, and a crafted response from the DNS server queried by an Agent DNS item.

CVSS severity3.9
Low
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in the Zabbix Agent allows remote authenticated users to expose data, crash the agent, or execute code via a DNS response. The Agent DNS-response parser fails to verify that RDLENGTH remains within the received buffer before reading record data. Exploitation requires high privileges, user interaction, and a crafted response from the DNS server queried by an Agent DNS item.

The record

CVE
CVE-2023-32726
Published
Dec 18, 2023
Updated
Nov 3, 2025
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-754, CAPEC-540, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 18, 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 <=5.0.39 changes=[{"at":"5.0.40","status":"unaffected"}]
  2. Affected versionversion=6.0.0 <=6.0.23 changes=[{"at":"6.0.24","status":"unaffected"}]
  3. Affected versionversion=6.4.0 <=6.4.8 changes=[{"at":"6.4.9","status":"unaffected"}]
  4. Affected versionversion=7.0.0alpha1 <=7.0.0alpha7 changes=[{"at":"7.0.0alpha8","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=5.0.0 <=5.0.39 changes=[{"at":"5.0.40","status":"unaffected"}]; version=6.0.0 <=6.0.23 changes=[{"at":"6.0.24","status":"unaffected"}]; version=6.4.0 <=6.4.8 changes=[{"at":"6.4.9","status":"unaffected"}]; version=7.0.0alpha1 <=7.0.0alpha7 changes=[{"at":"7.0.0alpha8","status":"unaffected"}]

Published CVSS scores

3.9ZabbixCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
8.1NIST NVDCVSS:3.1/AV:N/AC:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CAPEC-540Overread Buffers
T1203Exploitation for Client Execution

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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