CVE-2021-22565mediumCWE-284

CVE-2021-22565: medium-severity vulnerability in Google Exposure-notifications-verification-serv…

Insufficient Granularity of Access Control in GAEN Notification Server

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.5epss 0.4%
In short

An attacker can invalidate verification codes used by patients to report COVID exposure, preventing them from sharing their exposure data with others who may have been in contact.

Technical detail

The GAEN Notification Server contains insufficient access control granularity (CWE-284) that allows an attacker to prematurely expire verification codes, preventing legitimate users from uploading Temporary Exposure Keys (TEKs) and triggering exposure notifications. This is a pre-authentication attack that impacts confidentiality and availability of the exposure notification system.

Summary generated and translated by AI from the official description.
An attacker could prematurely expire a verification code, making it unusable by the patient, making the patient unable to upload their TEKs to generate exposure notifications. We recommend upgrading the Exposure Notification server to V1.1.2 or greater.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Affected products
Google LLC · Google Exposure-notifications-verification-server