CVE-2025-61974Network attack vector

Service interruption via uncleared failed-handshake memory

Published Oct 15, 2025 · Updated Oct 15, 2025

Memory leak in F5 BIG-IP products allows remote attackers to exhaust TMM memory with crafted TLS requests to configured virtual servers. After an SSL handshake failure, TMM does not clear allocated memory, so repeated undisclosed requests accumulate memory when a client SSL profile is attached. The request path is unauthenticated and network-reachable, but exposure requires a virtual server with a client SSL profile; sustained traffic can interrupt service without reading or modifying data.

CVSS severity8.7
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in F5 BIG-IP products allows remote attackers to exhaust TMM memory with crafted TLS requests to configured virtual servers. After an SSL handshake failure, TMM does not clear allocated memory, so repeated undisclosed requests accumulate memory when a client SSL profile is attached. The request path is unauthenticated and network-reachable, but exposure requires a virtual server with a client SSL profile; sustained traffic can interrupt service without reading or modifying data.

The record

CVE
CVE-2025-61974
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
F5 Networks
Product
BIG-IP Next for Kubernetes
Classifications
CWE-401, 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=2.0.0 <* changes=[{"at":"2.1.0-EHF-1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IP Next for Kubernetesversion=2.0.0 <* changes=[{"at":"2.1.0-EHF-1","status":"unaffected"}]
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
F5 Networks · BIG-IP Next CNFversion=1.1.0 <* changes=[{"at":"1.4.0-EHF-3","status":"unaffected"}]; version=2.0.0 <* changes=[{"at":"2.1.0-EHF-1","status":"unaffected"},{"at":"2.0.2-EHF-2","status":"unaffected"},{"at":"2.0.0-EHF-2","status":"unaffected"}]
F5 Networks · BIG-IP Next SPKversion=1.7.0 <* changes=[{"at":"1.7.14-EHF-2","status":"unaffected"}]; version=1.8.0 <*; version=1.9.0 <*; version=2.0.0 <* changes=[{"at":"2.1.0-EHF-1","status":"unaffected"},{"at":"2.0.2-EHF-2","status":"unaffected"},{"at":"2.0.0-EHF-2","status":"unaffected"}]

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.

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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-401Missing Release of Memory after Effective Lifetime
T1499.004Endpoint Denial of Service: Application 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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