CVE-2023-43125 - CVE House
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Status published Medium CVE-2023-43125

BIG-IP APM Clients TunnelCrack vulnerability

Vulnerability Description

BIG-IP APM clients may send IP traffic outside of the VPN tunnel.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Bypassing Tunnels: Leaking VPN Client Traffic by Abusing Routing Tables https://papers.mathyvanhoef.com/usenix2023-tunnelcrack.pdf

References

More from F5

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CVE-2025-61990
TMM vulnerability
High 8.7
CVE-2025-61974
BIG-IP SSL/TLS vulnerability
High 8.7
CVE-2025-61960
BIG-IP APM portal access vulnerability
High 8.7
CVE-2025-61958
BIG-IP TMSH vulnerability
High 8.5
CVE-2025-61955
F5OS vulnerability
High 8.5

Affected Vendor

Affected Software

BIG-IP Edge Client, F5 Access
Vulnerable Versions:
7.2.3, 3.0

Timeline

Official Publish: September 27th, 2023
Last Modified: September 24th, 2024
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses (CWE)

CWE-319

MITRE ATT&CK TTPs

T1040 Network Sniffing
Collection
T1557 Adversary-in-the-Middle
Credential Access
T1552 Unsecured Credentials
Credential Access
T1078 Valid Accounts
Persistence
T1071 Application Layer Protocol
Command and Control