CVE-2021-22552

Name: CVE-2021-22552
Creator: NVD / NIST
Published: 2021-08-02T16:15:07.817+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.15%

Last modified Jun 17, 2026

CVE-2021-22552 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An untrusted memory read vulnerability in Asylo versions up to 0.6.1 allows an untrusted attacker to pass a syscall number in MessageReader that is then used by sysno() and can bypass validation. This can allow the attacker to read memory from within the secure enclave. EPSS estimates a 0.15% chance of exploitation in the next 30 days.

Description

An untrusted memory read vulnerability in Asylo versions up to 0.6.1 allows an untrusted attacker to pass a syscall number in MessageReader that is then used by sysno() and can bypass validation. This can allow the attacker to read memory from within the secure enclave. We recommend updating to Asylo 0.6.3 or past https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1a

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.15%

4.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Google	Asylo	<= 0.6.1

References

https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1aExploit, Patch, Third Party Advisory
https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1aExploit, Patch, Third Party Advisory

Timeline

Published: Aug 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22552?

How severe is CVE-2021-22552?

CVE-2021-22552 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.15% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22552?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22552?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST