CVE-2025-64734 Denial of service in T21 Reader
An attacker with physical access can cause a denial of service on the T21 Reader, preventing cardholders from entering the facility.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-64734?
CVE-2025-64734 is a low-severity denial of service vulnerability in Gallagher T21 Reader, published on 18 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Missing Release of Resource after Effective Lifetime (CWE-772) in the T21 Reader allows an attacker with physical access to the Reader to perform a denial-of-service attack against that specific reader, preventing cardholders from badging for entry.
This issue affects Command Centre Server:
9.30 prior to vCR9.30.251028a (distributed in 9.30.2881 (MR3)), 9.20 prior to vCR9.20.251028a (distributed in 9.20.3265 (MR5)), 9.10 prior to vCR9.10.251028a (distributed in 9.10.4135 (MR8)), all versions of 9.00 and prior.
Weakness: CWE-772
Which versions are affected by CVE-2025-64734?
How do I fix CVE-2025-64734?
No fix has been published for CVE-2025-64734 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-64734 being exploited?
There is no known exploitation of CVE-2025-64734 in the wild and no public exploit code.
Sources
Also known as GHSA-r4wh-whpg-rc2q.