CVE-2025-54500Network attack vector

Denial of service via malformed HTTP/2 frames

Published Aug 13, 2025 · Updated Nov 3, 2025

HTTP/2 resource exhaustion in affected F5 BIG-IP products allows remote attackers to interrupt service with malformed control frames. Server-generated stream resets release streams from the protocol-level concurrency count while associated request processing continues, permitting work to exceed the configured stream limit. Exposure requires an HTTP/2-enabled virtual server; sustained traffic causes high CPU use and memory exhaustion on the data plane.

CVSS severity5.3
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP/2 resource exhaustion in affected F5 BIG-IP products allows remote attackers to interrupt service with malformed control frames. Server-generated stream resets release streams from the protocol-level concurrency count while associated request processing continues, permitting work to exceed the configured stream limit. Exposure requires an HTTP/2-enabled virtual server; sustained traffic causes high CPU use and memory exhaustion on the data plane.

The record

CVE
CVE-2025-54500
Published
Aug 13, 2025
Updated
Nov 3, 2025
Vendor
F5 Networks
Product
BIG-IP Next for Kubernetes
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=2.0.0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IP Next for Kubernetesversion=2.0.0 <*
F5 Networks · BIG-IPversion=15.1.0 <*; version=16.1.0 <*; version=17.1.0 <*; version=17.5.0 <*
F5 Networks · BIG-IP Next CNFversion=1.1.0 <*; version=2.0.0 <*
F5 Networks · BIG-IP Next SPKversion=1.7.0 <*; version=2.0.0 <*
F5 Networks · BIG-IP Nextversion=20.3.0 <*

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.

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-770Allocation of Resources Without Limits or Throttling
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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