CVE-2025-52585Network attack vector

Service interruption via Client SSL null dereference

Published Aug 13, 2025 · Updated Aug 13, 2025

Denial of service in F5 BIG-IP allows remote attackers to terminate the Traffic Management Microkernel via crafted network requests. The affected Client SSL path dereferences a null pointer while processing undisclosed requests; F5 has not published the triggering request structure. Reachability requires a virtual server using an LTM Client SSL profile with SSL Forward Proxy and Anonymous Diffie-Hellman ciphers enabled, and the bounded consequence is a TMM crash and traffic interruption.

CVSS severity8.7
High
EPSS probability0.34%
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 allows remote attackers to terminate the Traffic Management Microkernel via crafted network requests. The affected Client SSL path dereferences a null pointer while processing undisclosed requests; F5 has not published the triggering request structure. Reachability requires a virtual server using an LTM Client SSL profile with SSL Forward Proxy and Anonymous Diffie-Hellman ciphers enabled, and the bounded consequence is a TMM crash and traffic interruption.

The record

CVE
CVE-2025-52585
Published
Aug 13, 2025
Updated
Aug 13, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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 <*
  2. Affected versionversion=16.1.0 <16.1.6
  3. Affected versionversion=17.1.0 <17.1.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=15.1.0 <*; version=16.1.0 <16.1.6; version=17.1.0 <17.1.2.2

Published CVSS scores

8.7F5 NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5F5 NetworksCVSS: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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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