# 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.

- **Severity:** Low 2.4 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Nov 2025
- **Updated:** 19 Nov 2025
- **Also known as:** GHSA-r4wh-whpg-rc2q

## 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 (Missing Release of Resource after Effective Lifetime)

## 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.

## Is CVE-2025-64734 being exploited?

There is no known exploitation of CVE-2025-64734 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-64734 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-64734 in the wild and no public exploit code.

Affected product: Gallagher T21 Reader. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-64734/ (Markdown: https://insights.sbomify.com/CVE-2025-64734/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-64734
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-64734
- OSV: https://osv.dev/vulnerability/CVE-2025-64734

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-64734/
Summaries are generated and may contain mistakes; the official description above is the record.