PT-2026-45997 · Mercusys · Ac12G

Tymbark7372 · CVE-2026-36609 · Published 2026-06-03 · Updated 2026-06-03

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions Mercusys AC12G (EU) V1 firmware AC12G(EU) V1 200909

Description The device uses a static authentication nonce that remains unchanged between requests originating from the same source IP. This issue, combined with a predictable XOR-based password encoding implemented in the securityEncode() function, enables an attacker to reverse captured authentication tokens to recover the plaintext password.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-327

CWE-341

Related Identifiers

CVE-2026-36609

Affected Products

Ac12G

References · 3

• 🔥 https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36609.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-36609 · Security Note
• https://t.me/cveNotify/165878 · Telegram Post