CVE-2025-22891Network attack vector

Unauthenticated connection-processing halt via undisclosed Diameter traffic

Published Feb 5, 2025 · Updated Feb 5, 2025

Denial of service in F5 BIG-IP PEM allows remote attackers to stop new client connections by sending traffic to a configured listener. F5 has not disclosed the traffic pattern or internal operation that causes memory use to grow and the listener Virtual Server to stop accepting connections. The issue is reachable without authentication only when a PEM Control Plane listener Virtual Server uses a Diameter Endpoint profile, and the bounded impact is connection refusal plus memory-resource growth.

CVSS severity7.5
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in F5 BIG-IP PEM allows remote attackers to stop new client connections by sending traffic to a configured listener. F5 has not disclosed the traffic pattern or internal operation that causes memory use to grow and the listener Virtual Server to stop accepting connections. The issue is reachable without authentication only when a PEM Control Plane listener Virtual Server uses a Diameter Endpoint profile, and the bounded impact is connection refusal plus memory-resource growth.

The record

CVE
CVE-2025-22891
Published
Feb 5, 2025
Updated
Feb 5, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-772, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 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=15.1.0 <* changes=[{"at":"HotfixBIGIP-15.1.10.6.0.11.6-ENG.iso","status":"unaffected"}]
  2. Affected versionversion=16.1.0 <16.1.5
  3. Affected versionversion=17.1.0 <17.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=15.1.0 <* changes=[{"at":"HotfixBIGIP-15.1.10.6.0.11.6-ENG.iso","status":"unaffected"}]; version=16.1.0 <16.1.5; version=17.1.0 <17.1.2

Published CVSS scores

8.7F5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
7.5F5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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-772Missing Release of Resource after Effective Lifetime
T1499Endpoint Denial 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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