CVE-2026-2540 PUBLISHED

Micca KE700 Acceptance of previously used rolling codes

Assigner: ASRG
Reserved: 15.02.2026 Published: 15.02.2026 Updated: 15.02.2026

The Micca KE700 system contains flawed resynchronization logic and is vulnerable to replay attacks. This attack requires sending two previously captured codes in a specific sequence. As a result, the system can be forced to accept previously used (stale) rolling codes and execute a command. Successful exploitation allows an attacker to clone the alarm key. This grants the attacker unauthorized access to the vehicle to unlock or lock the doors.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:L/SI:L/SA:H/V:D/RE:M
CVSS Score: 8.4

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	Low	Confidentiality	Low
Attack Complexity	Low	Integrity	High	Integrity	Low
Attack Requirements	None	Availability	None	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Micca Auto Electronics Co., Ltd.
Product	Car Alarm System KE700
Versions	Default: affected Version KE700 is affected Version KE700+ is unknown

Solutions

Enforce strict anti-replay: The receiver must maintain a persistent state (e.g., the counter value of the last valid code). It must never accept a code with a counter value less than or equal to the last known valid counter.
Secure resynchronization logic: The logic triggered by an old code is the flaw and must be removed. Secure resynchronization should only be triggered by codes that are ahead of the current counter to allow a "drifted" key fob to re-sync.

Credits

Danilo Erazo finder

References

https://asrg.io/security-advisories/cve-2026-2540/

Problem Types

CWE-288: Authentication Bypass Using an Alternate Path or Channel CWE
CWE-294: Authentication Bypass by Capture-replay CWE

Impacts

CAPEC-395: Bypassing Electronic Locks and Access Controls