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PatchSiren cyber security CVE debrief

CVE-2026-27790 Gallagher CVE debrief

CVE-2026-27790 is an Uncaught Exception vulnerability in T20 Readers. An authenticated and authorized operator can trigger a restart by sending specific requests, resulting in a temporary denial of service. Affected versions include Command Centre 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, and all versions of 9.10 and prior. The vulnerability has a CVSS score of 2.7, indicating a low severity.

Vendor
Gallagher
Product
T-20 Readers
CVSS
LOW 2.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-07
Original CVE updated
2026-07-07
Advisory published
2026-07-07
Advisory updated
2026-07-07

Who should care

Security teams and administrators responsible for Command Centre systems should assess and apply patches to prevent potential temporary denial of service. They should also verify authentication and authorization controls for T20 Readers and monitor system restarts and error logs for potential exploitation attempts. Additionally, they should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The vulnerability, classified as CWE-248 Uncaught Exception, allows an authenticated and authorized operator to trigger a restart by sending specific requests to T20 Readers. This results in a temporary denial of service. The CVSS score is 2.7, indicating a low severity. The vulnerability affects multiple versions of Command Centre, including 9.50, 9.40, 9.30, 9.20, and all versions of 9.10 and prior. The official CVE record and NVD detail page provide further information.

Defensive priority

Low priority due to low CVSS score and limited impact.

Recommended defensive actions

  • Assess Command Centre system versions and apply patches if necessary
  • Verify authentication and authorization controls for T20 Readers
  • Monitor system restarts and error logs for potential exploitation attempts
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-07T05:16:50.500Z and has not been modified since then. The NVD entry is currently in the 'Received' status. The source item URL for CVE-2026-27790 is provided. The Gallagher security advisory for CVE-2026-27790 is referenced. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-07T05:16:50.500Z and has not been modified since then. The NVD entry is currently in the 'Received' status.