CVE-2025-43878 F5OS-A/C CLI vulnerability

High 8.3 Published 7 May 2025 Updated 26 Feb 2026

Authenticated administrators can bypass Appliance mode restrictions using tcpdump, requiring a patch to restore security controls.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-43878?

CVE-2025-43878 is a high-severity vulnerability in F5OS - Appliance, published on 7 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

When running in Appliance mode, an authenticated attacker assigned the Administrator or Resource Administrator role may be able to bypass Appliance mode restrictions utilizing system diagnostics tcpdump command utility on a F5OS-C/A system.

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

Weakness: CWE-149, CWE-1286

Which versions are affected by CVE-2025-43878?

It affects 2 products.

Products include F5 F5os-A, F5 F5os-C.

How do I fix CVE-2025-43878?

No fix has been published for CVE-2025-43878 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-43878 being exploited?

There is no known exploitation of CVE-2025-43878 in the wild and no public exploit code.

Sources

Also known as GHSA-jv2x-vg3f-2535.