Vulnerability · Published Sep 28, 2026 · Assigned by CERT-PL

CVE-2026-52748Missing authentication for backup functionality in Kaon AR2140X

High 7.1

In plain English

A high-severity missing authentication in AR2140 from Kaon. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.3%top 82.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

The Kaon AR2140X router contains a vulnerability where the backup functionality is accessible without authentication. This allows an unauthenticated remote attacker to trigger a configuration backup and retrieve it in a form encrypted by a device-specific key. Triggering this function renders the router inoperable for a substantial period of time. This issue was identified in firmware versions up to 4.2.17. Status of newer versions remains unknown.

Affected products (as reported)

Vendor	Product	Versions
Kaon	AR2140	0 – through 4.2.17

Weakness: CWE-306 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://cert.pl/en/posts/2026/09/CVE-2026-52748 third-party-advisory