CVE-2023-26941Public exploit

Unauthorized entry via crackable RFID tag keys

Published Dec 4, 2023 · Updated Aug 2, 2024

Weak RFID encryption in Yale Conexis L1 1.1.0 allows physically proximate attackers to clone a paired tag and unlock the door. The lock uses MIFARE Classic 1K cards with seven non-default keys that a Proxmark3 recovered in about 20 seconds, enabling a full card dump to be copied. Brief access to the original tag and specialized RFID hardware are required; using either copy updates alternating card data and invalidates the other.

CVSS severity6.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak RFID encryption in Yale Conexis L1 1.1.0 allows physically proximate attackers to clone a paired tag and unlock the door. The lock uses MIFARE Classic 1K cards with seven non-default keys that a Proxmark3 recovered in about 20 seconds, enabling a full card dump to be copied. Brief access to the original tag and specialized RFID hardware are required; using either copy updates alternating card data and invalidates the other.

The record

CVE
CVE-2023-26941
Published
Dec 4, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-326
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength

Public exploit references

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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