CVE-2021-22549

Local trusted-memory overwrite via unchecked pointer

Published Jun 8, 2021 · Updated Sep 17, 2024

Asylo before 0.6.2 allows local users to overwrite arbitrary trusted enclave memory through TrustedPrimitives::UntrustedCall. The function validates an untrusted input pointer and then uses the mutable pointer again, allowing it to be changed to trusted memory after the bounds check. The attack requires low-privilege local access to an Asylo enclave application and can compromise enclave confidentiality and integrity while causing limited availability impact.

CVSS severity6.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Asylo before 0.6.2 allows local users to overwrite arbitrary trusted enclave memory through TrustedPrimitives::UntrustedCall. The function validates an untrusted input pointer and then uses the mutable pointer again, allowing it to be changed to trusted memory after the bounds check. The attack requires low-privilege local access to an Asylo enclave application and can compromise enclave confidentiality and integrity while causing limited availability impact.

The record

CVE
CVE-2021-22549
Published
Jun 8, 2021
Updated
Sep 17, 2024
Vendor
Google
Product
Asylo
Classifications
CWE-823, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=0.6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · Asyloversion=unspecified <=0.6.2

Published CVSS scores

6.5NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-823Use of Out-of-range Pointer Offset
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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