CVE-2025-1695Network attack vector

Denial of service via missing WebSocket length validation

Published Mar 4, 2025 · Updated Mar 4, 2025

An infinite loop in F5 NGINX Unit 1.11.0 through 1.34.1 allows remote attackers to cause limited denial of service via WebSocket requests. The Java Language Module fails to validate a WebSocket payload length, allowing an undisclosed request to trap a module process in a CPU-consuming loop. Exposure requires the Java Language Module to process WebSockets on the data plane; the control plane is unaffected, and the consequence is service degradation rather than a reported crash.

CVSS severity5.3
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An infinite loop in F5 NGINX Unit 1.11.0 through 1.34.1 allows remote attackers to cause limited denial of service via WebSocket requests. The Java Language Module fails to validate a WebSocket payload length, allowing an undisclosed request to trap a module process in a CPU-consuming loop. Exposure requires the Java Language Module to process WebSockets on the data plane; the control plane is unaffected, and the consequence is service degradation rather than a reported crash.

The record

CVE
CVE-2025-1695
Published
Mar 4, 2025
Updated
Mar 4, 2025
Vendor
F5 Networks
Product
NGINX Unit
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 4, 2025Record 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=1.11.0 <1.34.2
  2. Affected versionversion=* <d7afeb2b94f1cd72ed02403609e5484f9514e5eb

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · NGINX Unitversion=1.11.0 <1.34.2; version=* <d7afeb2b94f1cd72ed02403609e5484f9514e5eb

Published CVSS scores

6.9F5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3F5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
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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