CVE-2021-27935

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-03 · updated 2026-06-17
Weakness: CWE-522

Description

An issue was discovered in AdGuard before 0.105.2. An attacker able to get the user's cookie is able to bruteforce their password offline, because the hash of the password is stored in the cookie.

Affected products

Adguard Home: before 0.105.2 — fixed in 0.105.2

How to fix

Upgrade to a fixed version: Adguard Home 0.105.2. Check the vendor advisory for mitigations.

References

https://github.com/AdguardTeam/AdGuardHome/issues/2470
https://github.com/AdguardTeam/AdGuardHome/issues/2470

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