CVE-2025-49643— Frontend DoS vulnerability due to asymmetric resource consumption
Quick assessment
Affected
Zabbix Zabbix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Zabbix是Zabbix公司的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix存在安全漏洞，该漏洞源于经过身份验证的用户可通过发送特制参数到/imgstore.php导致CPU负载过高，可能导致拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-49643
Vulnerability Information
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Vulnerability Title
Frontend DoS vulnerability due to asymmetric resource consumption
Source: CVE Program / CVE List V5
Vulnerability Description
An authenticated Zabbix user (including Guest) is able to cause disproportionate CPU load on the webserver by sending specially crafted parameters to /imgstore.php, leading to potential denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Zabbix 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zabbix是Zabbix公司的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix存在安全漏洞，该漏洞源于经过身份验证的用户可通过发送特制参数到/imgstore.php导致CPU负载过高，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-49643
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-49643 (1)
Same Patch Batch · Zabbix · 2025-12-01 · 3 CVEs total
| CVE-2025-27232 | Frontend arbitrary file read in oauth.authorize action | |
| CVE-2025-49642 | Agent builds for AIX vulnerable to library loading hijacking |
IV. Related Vulnerabilities
Same product: Zabbix
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Host PSK extraction in Zabbix API -
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Use-after-free read in script item/preprocessing HttpRequest -
CVE-2026-23934
Frontend DoS via the validate.api.exists action
Same vendor: Zabbix
-
CVE-2026-59781
Improper validation of custom installation directories on Wi -
CVE-2026-23938
Server DoS via JavaScript preprocessing or script items -
CVE-2026-23937
Host PSK extraction in Zabbix API -
CVE-2026-23935
Use-after-free read in script item/preprocessing HttpRequest -
CVE-2026-23934
Frontend DoS via the validate.api.exists action
Same weakness: CWE-405
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pypdf: Possible long runtimes/large memory usage when retrie
V. Comments for CVE-2025-49643
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