CVE-2021-25909Network attack vector

Service interruption via port 7919 packets

Published Jan 29, 2021 · Updated Sep 16, 2024

Uncontrolled resource consumption in ZIV Automation 4CCT-EA6-334126BF firmware 3.23.80.27.36371 lets remote attackers interrupt service. The service listening on port 7919 consumes resources while processing specific packets, disrupting device operation. No authentication or user interaction is required, and normal operation returns gradually after the packet flow stops.

CVSS severity8.6
High
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in ZIV Automation 4CCT-EA6-334126BF firmware 3.23.80.27.36371 lets remote attackers interrupt service. The service listening on port 7919 consumes resources while processing specific packets, disrupting device operation. No authentication or user interaction is required, and normal operation returns gradually after the packet flow stops.

The record

CVE
CVE-2021-25909
Published
Jan 29, 2021
Updated
Sep 16, 2024
Vendor
ZIV Automation
Product
4CCT-EA6-334126BF
Classifications
CWE-400, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.23.80.27.36371

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ZIV Automation · 4CCT-EA6-334126BFversion=3.23.80.27.36371

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.6INCIBECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T0814Denial of Service

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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