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CVE-2025-49643· NVD / CVE Program· CNA Zabbix

Frontend DoS vulnerability due to asymmetric resource consumption

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.

MediumCVSS 6.0 · v4.0—No exploit Fix available
Published
Dec 1, 2025
Updated
Sep 25, 2026
EPSS
0.3% · 25th percentile
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Report tools

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Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Zabbix
6.0
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
zabbixfrontend

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • zabbix frontend6.0.0 and later · before 6.0.42
  • zabbix frontend7.0.0 and later · before 7.0.19
  • zabbix frontend7.2.0 and later · before 7.2.13
  • zabbix frontend7.4.0 and later · before 7.4.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Zabbix). Independent of NVD's CPE analysis and usually ahead of it.

  • Zabbix Zabbix

    • 6.0.0 and later · up to and including 6.0.41affected · gitfixed in 6.0.42
    • 7.0.0 and later · up to and including 7.0.18affected · gitfixed in 7.0.19
    • 7.2.0 and later · up to and including 7.2.12affected · gitfixed in 7.2.13
    • 7.4.0 and later · up to and including 7.4.2affected · gitfixed in 7.4.3

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12zabbixall versions—
Debian:13zabbixbefore 1:7.0.22+dfsg-1~deb13u11:7.0.22+dfsg-1~deb13u1
Debian:14zabbixbefore 1:7.0.22+dfsg-11:7.0.22+dfsg-1

Same product

zabbix: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-43515X-Forwarded-For header is active by default causes access to Zabbix sites in maintenance mode
    39Monitor
  • CVE-2025-27232Frontend arbitrary file read in oauth.authorize action
    27Monitor
  • CVE-2023-30958DOM XSS in Developer mode dashboard via redirect GET parameter
    24Monitor
  • CVE-2023-29457Insufficient validation of Action form input fields
    24Monitor
  • CVE-2023-29455Reflected XSS in several fields of graph form
    24Monitor
  • CVE-2023-29456Inefficient URL schema validation
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Zabbix Zabbix6.0.42Vendor (CNA)
Zabbix Zabbix7.0.19Vendor (CNA)
Zabbix Zabbix7.2.13Vendor (CNA)
Zabbix Zabbix7.4.3Vendor (CNA)
debian:zabbix1:7.0.22+dfsg-1~deb13u1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-405 · Asymmetric Resource Consumption (Amplification)

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records