CVE-2021-27935

CVE-2021-27935 is a high-severity vulnerability in Adguard Adguard Home with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

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.

Frequently asked questions

What is CVE-2021-27935?
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.
How severe is CVE-2021-27935?
CVE-2021-27935 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-27935 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27935?
CVE-2021-27935 affects Adguard Adguard Home. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27935?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-27935 published?
CVE-2021-27935 was published on 2021-03-03 and last updated on 2026-06-17.

References

Affected products (1)

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