What is CVE-2020-8904?

CVE-2020-8904 is a medium-severity vulnerability in Google Asylo, classified under CWE-823. CVSS score: 6.4/10. Published 2020-08-12.

How severe is CVE-2020-8904?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Buffer overflow in Google Asylo

CVE-2020-8904

An arbitrary memory overwrite vulnerability in the trusted memory of Asylo exists in versions prior to 0.6.0. As the ecall_restore function fails to validate the range of the output_len pointer, an attacker can manipulate the tmp_output_len value and write to an arbitrary location in the trusted (enclave) memory. We recommend updating Asylo to version 0.6.0 or later.

Published 2020-08-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.002 (12.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Asylo
Google Llc Asylo — versions stable

Weakness classification (CWE)

References

github.com/google/asylo/commit/e582f36ac49ee11a21d23ad6a30c333092e0a94e (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8904?: CVE-2020-8904 is a medium-severity vulnerability in Google Asylo, classified under CWE-823. CVSS score: 6.4/10. Published 2020-08-12.
How severe is CVE-2020-8904?: Medium severity. CVSS v3 base score is 6.4 out of 10.