Micca KE700 Acceptance of previously used rolling codes

published 2026-02-15 8mo ago modified 2026-06-17 4mo ago also EUVD-2026-5831

cvss: 8.4; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits: 0; none known

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.

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 8mo ago (2026-02-17)

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.4	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
CNA	4.0	8.4	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:D/RE:M/U:X

Affected products

Micca Auto Electronics Co., Ltd. Car Alarm System KE700

Classification

Weakness

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

References

asrg.io /security-advisories/cve-2026-2540/
third-party-advisory

Sources

CVE List CVE-2026-2540
NVD CVE-2026-2540

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