CVE-2025-54854Network attack vector

Unauthenticated apmd crash via invalid JWT header

Published Oct 15, 2025 · Updated Oct 15, 2025

Out-of-bounds read in F5 BIG-IP APM allows remote attackers to crash apmd by sending traffic with an invalid JWT header. The APM OAuth JWT parser reads beyond a buffer boundary while parsing the invalid header, terminating the apmd process. Exposure requires a Resource Server or Resource Client OAuth access profile on a virtual server, and the reported consequence is an APM service interruption.

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

Out-of-bounds read in F5 BIG-IP APM allows remote attackers to crash apmd by sending traffic with an invalid JWT header. The APM OAuth JWT parser reads beyond a buffer boundary while parsing the invalid header, terminating the apmd process. Exposure requires a Resource Server or Resource Client OAuth access profile on a virtual server, and the reported consequence is an APM service interruption.

The record

CVE
CVE-2025-54854
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-125, T1499
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

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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 <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

7.5F5 NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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

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-125Out-of-bounds Read
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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