CVE-2020-8918: Google Go-Tpm

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

An improperly initialized 'migrationAuth' value in Google's go-tpm TPM1.2 library versions prior to 0.3.0 can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both 'encUsageAuth' and 'encMigrationAuth', and then can calculate 'usageAuth ^ encMigrationAuth' as the 'migrationAuth' can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to 0.3.0 or later, or, if you cannot update, to call CreateWrapKey with a random 20-byte value for 'migrationAuth'.

Affected products

• Google Go-Tpm: before 0.3.0 (fixed in 0.3.0)

Published 2020-08-11. Last modified 2026-06-17.