Is CVE-2026-27790 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-27790 being exploited in the wild.

How severe is CVE-2026-27790?

Low severity, with a CVSS score of 2.7, published 7 July 2026.

Which products and versions are affected?

Gallagher T20 Reader 9.50 prior to vCR9.50.260616a; 9.40 prior to vCR9.40.260616a; 9.30 prior to vCR9.30.260616a; 9.20 prior to vCR9.20.260616a; all versions of 9.10 and prior.

Is there a fix for CVE-2026-27790?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-27790 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-27790?

Check whether you run Gallagher T20 Reader at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-27790: Gallagher T20 Readers uncaught exception denial of service

CVE-2026-27790 · Severity: low · CVSS 2.7 · Published 2026-07-07

Gallagher T20 Readers, which are hardware devices used for secure facility access control, are vulnerable to a temporary service disruption. An authorized operator with high-level permissions can send specific requests that cause the reader to restart. This results in a temporary denial of service where the reader may be unavailable for processing access requests during the reboot cycle.

Vendors: Gallagher.

Quick answers

Is CVE-2026-27790 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-27790 being exploited in the wild.
How severe is CVE-2026-27790?: Low severity, with a CVSS score of 2.7, published 7 July 2026.
Which products and versions are affected?: Gallagher T20 Reader 9.50 prior to vCR9.50.260616a; 9.40 prior to vCR9.40.260616a; 9.30 prior to vCR9.30.260616a; 9.20 prior to vCR9.20.260616a; all versions of 9.10 and prior.
Is there a fix for CVE-2026-27790?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-27790 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-27790?: Check whether you run Gallagher T20 Reader at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A vulnerability classified as an Uncaught Exception (CWE-248) exists in Gallagher T20 Readers managed by Command Centre. The flaw is triggered when an authenticated and authorized operator sends specific requests to the device, causing the software to crash and the hardware to restart. This attack requires high privileges (PR:H) and is reachable over the network. The primary impact is a temporary denial of service (DoS) while the reader reboots. Gallagher recommends disabling the diagnostic web interface via DIP switch settings and software configuration as a mitigation, as this interface is the primary vector for these requests.

Affected products

Gallagher T20 Readers 9.50 prior to vCR9.50.260616a; 9.40 prior to vCR9.40.260616a; 9.30 prior to vCR9.30.260616a; 9.20 prior to vCR9.20.260616a; all versions of 9.10 and prior

Timeline

2026-07-07: disclosed
2026-07-07: advisory

References

https://security.gallagher.com/en-NZ/Security-Advisories/CVE-2026-27790

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