CVE-2021-22550: Enclave memory overwrite/overread vulnerability in Asylo UntrustedCacheMalloc::GetBuffer

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-08 · updated 2026-06-17
Weakness: CWE-823

Description

An attacker can modify the pointers in enclave memory to overwrite arbitrary memory addresses within the secure enclave. It is recommended to update past 0.6.3 or git commit https://github.com/google/asylo/commit/a47ef55db2337d29de19c50cd29b0deb2871d31c

Affected products

Google LLC Asylo: before 0.6.3 — fixed in 0.6.3

How to fix

Upgrade to a fixed version: Google LLC Asylo 0.6.3. Check the vendor advisory for mitigations.

References

https://github.com/google/asylo/commit/a47ef55db2337d29de19c50cd29b0deb2871d31c
https://github.com/google/asylo/commit/a47ef55db2337d29de19c50cd29b0deb2871d31c

Get alerted when CVE-2021-22550 or the next vulnerability affects your stack