CVE-2025-49643Network attack vector

Authenticated service interruption via crafted image parameters

Published Dec 1, 2025 · Updated Dec 1, 2025

Asymmetric resource consumption in affected Zabbix Frontend releases allows remote authenticated users to interrupt service. The /imgstore.php endpoint performs disproportionate CPU-intensive processing when it receives specially crafted HTTP parameters. Any authenticated account, including the Guest role, can drive webserver CPU load high enough to deny Frontend availability.

CVSS severity6.0
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Asymmetric resource consumption in affected Zabbix Frontend releases allows remote authenticated users to interrupt service. The /imgstore.php endpoint performs disproportionate CPU-intensive processing when it receives specially crafted HTTP parameters. Any authenticated account, including the Guest role, can drive webserver CPU load high enough to deny Frontend availability.

The record

CVE
CVE-2025-49643
Published
Dec 1, 2025
Updated
Dec 1, 2025
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-405, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 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 <=6.0.41 changes=[{"at":"6.0.42","status":"unaffected"}]
  2. Affected versionversion=7.0.0 <=7.0.18 changes=[{"at":"7.0.19","status":"unaffected"}]
  3. Affected versionversion=7.2.0 <=7.2.12 changes=[{"at":"7.2.13","status":"unaffected"}]
  4. Affected versionversion=7.4.0 <=7.4.2 changes=[{"at":"7.4.3","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=6.0.0 <=6.0.41 changes=[{"at":"6.0.42","status":"unaffected"}]; version=7.0.0 <=7.0.18 changes=[{"at":"7.0.19","status":"unaffected"}]; version=7.2.0 <=7.2.12 changes=[{"at":"7.2.13","status":"unaffected"}]; version=7.4.0 <=7.4.2 changes=[{"at":"7.4.3","status":"unaffected"}]

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.0ZabbixCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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-405Asymmetric Resource Consumption (Amplification)
T1499.004Application or System Exploitation

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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