How severe is CVE-2020-8904?

CVE-2020-8904 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2020-8904 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8904?

CVE-2020-8904 affects Google Asylo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8904?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-8904 published?

CVE-2020-8904 was published on 2020-08-12 and last updated on 2026-06-17.

CVE-2020-8904

CVE-2020-8904 is a medium-severity vulnerability in Google Asylo with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
CVSS v2: 5.5
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Google Asylo
Published: 2020-08-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-8904?: CVE-2020-8904 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2020-8904 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8904?: CVE-2020-8904 affects Google Asylo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8904?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-8904 published?: CVE-2020-8904 was published on 2020-08-12 and last updated on 2026-06-17.

References

https://github.com/google/asylo/commit/e582f36ac49ee11a21d23ad6a30c333092e0a94e

Affected products (1)

cpe:2.3:a:google:asylo:*:*:*:*:*:*:*:*

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