VULNERABILITY INTELLIGENCE
CVE-2026-36609
CVSS score7.3 HIGH
EPSS probability0.17%
CISA KEVNot currently listed
Published2026-06-03
Last modified2026-07-22
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Description
Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.
Weakness classification
- CWE-327: Use of a Broken or Risky Cryptographic Algorithm
- CWE-341: Predictable from Observable State