How severe is CVE-2021-26386?

CVE-2021-26386 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26386?

CVE-2021-26386 primarily affects Amd Ryzen 3 2200u Firmware. In total, 70 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26386?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26386 published?

CVE-2021-26386 was published on 2022-05-12 and last updated on 2026-06-17.

CVE-2021-26386

CVE-2021-26386 is a high-severity vulnerability in Amd Ryzen 3 2200u Firmware with a CVSS 3.x base score of 7.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Amd Ryzen 3 2200u Firmware
Published: 2022-05-12
Last modified: 2026-06-17

Description

A malicious or compromised UApp or ABL may be used by an attacker to issue a malformed system call to the Stage 2 Bootloader potentially leading to corrupt memory and code execution.

Frequently asked questions

What is CVE-2021-26386?: A malicious or compromised UApp or ABL may be used by an attacker to issue a malformed system call to the Stage 2 Bootloader potentially leading to corrupt memory and code execution.
How severe is CVE-2021-26386?: CVE-2021-26386 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26386?: CVE-2021-26386 primarily affects Amd Ryzen 3 2200u Firmware. In total, 70 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26386?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26386 published?: CVE-2021-26386 was published on 2022-05-12 and last updated on 2026-06-17.

References

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027

Affected products (70)

cpe:2.3:o:amd:ryzen_3_2200u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_2300u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3100_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3300g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3300x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5125c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5400u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5425c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5425u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5300g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5300ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5700g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5700ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5800x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5800x3d_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5900x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5950x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_2500u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_2600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_2600h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_2600x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_3400g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_3450g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_3600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_3600x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5560u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600hs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5625c_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5625u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5700g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5700ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_2700_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_2700u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_2700x_firmware:-:*:*:*:*:*:*:*

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