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Vulnerabilities

Security incident · CVE-2021-26383

Insufficient bounds checking in AMD TEE (Trusted Execution Environment) could allow an attacker with a compromised userspace to invoke a command with malformed arguments leading to

Published Sep 5, 2025 · catalog updated Sep 8, 2025 · AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-26383. EPSS is 0.17%. Act only if a listed version of AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.17%
Remediation
Advisory link
Affected products
vendor AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics patch: ComboAM4v2 PI 1.2.0.5

Insufficient bounds checking in AMD TEE (Trusted Execution Environment) could allow an attacker with a compromised userspace to invoke a command with malformed arguments leading to out of bounds memory access, potentially resulting in loss of integrity or availability.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics patch: ComboAM4v2 PI 1.2.0.5patch: ComboAM4v2 PI 1.2.0.5

How to fix CVE-2021-26383

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-26383. EPSS is 0.17%. Act only if a listed version of AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics is installed.

Which versions are affected?

Compare what you have installed with AMD AMD Ryzen™ 5000 Series Desktop Processors with Radeon™ Graphics patch: ComboAM4v2 PI 1.2.0.5 patch: ComboAM4v2 PI 1.2.0.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.17%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 5, 2025 · EUVD

    Detected

    Insufficient bounds checking in AMD TEE (Trusted Execution Environment) could allow an attacker with a compromised userspace to invoke a command with malformed arguments leading to out of bounds memory access, potentially resulting in loss of integrity or availability.

  2. Sep 8, 2025 · EUVD

    Updated

    Insufficient bounds checking in AMD TEE (Trusted Execution Environment) could allow an attacker with a compromised userspace to invoke a command with malformed arguments leading to out of bounds memory access, potentially resulting in loss of integrity or availability.

Sources

  • CVE.orgVulnerability recordCVE-2021-26383

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-26383

    30-day exploitation probability 0.17%

    first.org
  • EUVDVulnerability recordEUVD-2021-13189

    Insufficient bounds checking in AMD TEE (Trusted Execution Environment) could allow an attacker with a compromised userspace to invoke a command with malformed arguments leading to out of bounds memory access, potentially resulting in loss of integrity or availability.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026