Security Resilience

CVE-2023-40534

F5 Big-Ip Access Policy Manager 16.1.0 – 16.1.4.1

Published
10 October 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0065 50th percentile
Risk Priority 58 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-40534 is a high-severity Missing Release of Memory after Effective Lifetime (CWE-401) vulnerability in F5 Big-Ip Access Policy Manager. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked in the top 50% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

When a client-side HTTP/2 profile and the HTTP MRF Router option are enabled for a virtual server, and an iRule using the HTTP_REQUEST event or Local Traffic Policy are associated with the virtual server, undisclosed requests can cause TMM to…

more

terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE(s)
CWE-401

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.001 Junk Data Command And Control
Adversaries may add junk data to protocols used for command and control to make detection more difficult.
attack.mitre.org →
T1001.002 Steganography Command And Control
Adversaries may use steganographic techniques to hide command and control traffic to make detection efforts more difficult.
attack.mitre.org →
T1001.003 Protocol or Service Impersonation Command And Control
Adversaries may impersonate legitimate protocols or web service traffic to disguise command and control activity and thwart analysis efforts.
attack.mitre.org →
T1003 OS Credential Dumping Credential Access
Adversaries may attempt to dump credentials to obtain account login and credential material, normally in the form of a hash or a clear text password.
attack.mitre.org →
T1003.001 LSASS Memory Credential Access
Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-29163Same product: F5 Big-Ip Access Policy Manager
CVE-2025-21091Same product: F5 Big-Ip Access Policy Manager
CVE-2025-54805Same product: F5 Big-Ip Next Service Proxy For Kubernetes
CVE-2025-61974Same product: F5 Big-Ip Next Service Proxy For Kubernetes
CVE-2023-38423Same product: F5 Big-Ip Access Policy Manager
CVE-2023-38138Same product: F5 Big-Ip Access Policy Manager
CVE-2023-27378Same product: F5 Big-Ip Access Policy Manager
CVE-2023-40542Same product: F5 Big-Ip Access Policy Manager
CVE-2023-42768Same product: F5 Big-Ip Access Policy Manager
CVE-2023-28406Same product: F5 Big-Ip Access Policy Manager

Affected Assets

f5
big-ip access policy manager
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip advanced firewall manager
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip advanced web application firewall
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip analytics
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip application acceleration manager
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip application security manager
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip application visibility and reporting
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip carrier-grade nat
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip ddos hybrid defender
17.1.0 · 16.1.0 — 16.1.4.1
f5
big-ip domain name system
17.1.0 · 16.1.0 — 16.1.4.1
+10 more product configuration(s) — see NVD for full list

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 partial match
blocks

Secure SDLC practices directly enforce proper memory allocation/deallocation via coding standards, reviews, and tooling.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

References