CVE-2025-53856Network attack vector

Unauthenticated TMM termination via undisclosed traffic

Published Oct 15, 2025 · Updated Oct 15, 2025

Denial of service in affected F5 BIG-IP releases allows remote attackers to terminate TMM through network traffic. On virtual servers or NAT/SNAT objects using ePVA, undisclosed traffic makes the Traffic Management Microkernel terminate instead of safely processing or rejecting it. Reachability requires an ePVA-equipped platform and an accelerated object; the reported consequence is a traffic-processing service interruption without confidentiality or integrity impact.

CVSS severity8.7
High
EPSS probability0.35%
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 affected F5 BIG-IP releases allows remote attackers to terminate TMM through network traffic. On virtual servers or NAT/SNAT objects using ePVA, undisclosed traffic makes the Traffic Management Microkernel terminate instead of safely processing or rejecting it. Reachability requires an ePVA-equipped platform and an accelerated object; the reported consequence is a traffic-processing service interruption without confidentiality or integrity impact.

The record

CVE
CVE-2025-53856
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-705, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=15.1.0 <15.1.10.8
  2. Affected versionversion=16.1.0 <16.1.6.1
  3. Affected versionversion=17.1.0 <17.1.3
  4. Affected versionversion=17.5.0 <17.5.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=15.1.0 <15.1.10.8; version=16.1.0 <16.1.6.1; version=17.1.0 <17.1.3; version=17.5.0 <17.5.1.3

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 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-705Incorrect Control Flow Scoping
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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