CVE-2025-64734

Physical denial of service preventing card access

Published Nov 18, 2025 · Updated Nov 19, 2025

Resource exhaustion in Gallagher Security T21 Reader allows physically proximate attackers to interrupt badge-based entry at one reader. Gallagher identifies a resource that remains allocated after its effective lifetime but does not disclose the resource, code locus, or physical trigger. Physical access to a deployed T21 Reader is required, and the service interruption is confined to that reader, preventing cardholders from badging for entry.

CVSS severity2.4
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Gallagher Security T21 Reader allows physically proximate attackers to interrupt badge-based entry at one reader. Gallagher identifies a resource that remains allocated after its effective lifetime but does not disclose the resource, code locus, or physical trigger. Physical access to a deployed T21 Reader is required, and the service interruption is confined to that reader, preventing cardholders from badging for entry.

The record

CVE
CVE-2025-64734
Published
Nov 18, 2025
Updated
Nov 19, 2025
Vendor
Gallagher Security
Product
T21 Reader
Classifications
CWE-772, T1499
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=9.00
  2. Affected versionversion=9.10 <vCR9.10.251028a
  3. Affected versionversion=9.20 <vCR9.20.251028a
  4. Affected versionversion=9.30 <vCR9.30.251028a

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Gallagher Security · T21 Readerversion=0 <=9.00; version=9.10 <vCR9.10.251028a; version=9.20 <vCR9.20.251028a; version=9.30 <vCR9.30.251028a

Published CVSS scores

2.4Gallagher Group Ltd.CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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