CVE-2021-26337

Insufficient DRAM address validation in System Management Unit (SMU) may result in a DMA read from invalid DRAM address to SRAM resulting in SMU not servicing further requests.

Published: 2021-11-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-26337 is rated Low Risk (27/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.23%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-26337

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.06% 0.23% +0.17%
2 2025-03-17 0.04% 0.06% +0.02%
3 2023-03-07 — 0.04% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-26337

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2021-26337

Affected software / configurations for CVE-2021-26337

Vendor Product Version Raw CPE
amd epyc_7003_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7003_firmware:*:*:*:*:*:*:*:*
amd epyc_7002_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7002_firmware:*:*:*:*:*:*:*:*
amd epyc_72f3_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7313_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7313_firmware:*:*:*:*:*:*:*:*
amd epyc_7313p_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7313p_firmware:*:*:*:*:*:*:*:*
amd epyc_7343_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7343_firmware:*:*:*:*:*:*:*:*
amd epyc_73f3_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_73f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7413_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7413_firmware:*:*:*:*:*:*:*:*
amd epyc_7443_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7443_firmware:*:*:*:*:*:*:*:*
amd epyc_7443p_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7443p_firmware:*:*:*:*:*:*:*:*
amd epyc_7453_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7453_firmware:*:*:*:*:*:*:*:*
amd epyc_74f3_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_74f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7513_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7513_firmware:*:*:*:*:*:*:*:*
amd epyc_7543_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7543_firmware:*:*:*:*:*:*:*:*
amd epyc_7543p_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7543p_firmware:*:*:*:*:*:*:*:*
amd epyc_75f3_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_75f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7643_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7643_firmware:*:*:*:*:*:*:*:*
amd epyc_7663_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7663_firmware:*:*:*:*:*:*:*:*
amd epyc_7713_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7713_firmware:*:*:*:*:*:*:*:*
amd epyc_7713p_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7713p_firmware:*:*:*:*:*:*:*:*
amd epyc_7763_firmware < milanpi-sp3_1.0.0.4 cpe:2.3:o:amd:epyc_7763_firmware:*:*:*:*:*:*:*:*
amd epyc_7232p_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7232p_firmware:*:*:*:*:*:*:*:*
amd epyc_7252_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7252_firmware:*:*:*:*:*:*:*:*
amd epyc_7262_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7262_firmware:*:*:*:*:*:*:*:*
amd epyc_7272_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7272_firmware:*:*:*:*:*:*:*:*
amd epyc_7282_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7282_firmware:*:*:*:*:*:*:*:*
amd epyc_7302_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7302_firmware:*:*:*:*:*:*:*:*
amd epyc_7302p_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7302p_firmware:*:*:*:*:*:*:*:*
amd epyc_7352_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7352_firmware:*:*:*:*:*:*:*:*
amd epyc_7402_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7402_firmware:*:*:*:*:*:*:*:*
amd epyc_7402p_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7402p_firmware:*:*:*:*:*:*:*:*
amd epyc_7452_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7452_firmware:*:*:*:*:*:*:*:*
amd epyc_7502_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7502_firmware:*:*:*:*:*:*:*:*
amd epyc_7502p_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7502p_firmware:*:*:*:*:*:*:*:*
amd epyc_7532_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7532_firmware:*:*:*:*:*:*:*:*
amd epyc_7542_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7542_firmware:*:*:*:*:*:*:*:*
amd epyc_7552_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7552_firmware:*:*:*:*:*:*:*:*
amd epyc_7642_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7642_firmware:*:*:*:*:*:*:*:*
amd epyc_7662_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7662_firmware:*:*:*:*:*:*:*:*
amd epyc_7702_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7702_firmware:*:*:*:*:*:*:*:*
amd epyc_7702p_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7702p_firmware:*:*:*:*:*:*:*:*
amd epyc_7742_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7742_firmware:*:*:*:*:*:*:*:*
amd epyc_7f32_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7f32_firmware:*:*:*:*:*:*:*:*
amd epyc_7f52_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7f52_firmware:*:*:*:*:*:*:*:*
amd epyc_7f72_firmware < romepi-sp3_1.0.0.c cpe:2.3:o:amd:epyc_7f72_firmware:*:*:*:*:*:*:*:*
amd ryzen_3_3100_firmware — cpe:2.3:o:amd:ryzen_3_3100_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_3400g_firmware — cpe:2.3:o:amd:ryzen_5_3400g_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_3450g_firmware — cpe:2.3:o:amd:ryzen_5_3450g_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_3600_firmware — cpe:2.3:o:amd:ryzen_5_3600_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_3600x_firmware — cpe:2.3:o:amd:ryzen_5_3600x_firmware:-:*:*:*:*:*:*:*
amd ryzen_5300g_firmware — cpe:2.3:o:amd:ryzen_5300g_firmware:-:*:*:*:*:*:*:*
amd ryzen_5300ge_firmware — cpe:2.3:o:amd:ryzen_5300ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2920x_firmware — cpe:2.3:o:amd:ryzen_threadripper_2920x_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2950x_firmware — cpe:2.3:o:amd:ryzen_threadripper_2950x_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2970wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_2970wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_2990wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_2990wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_3960x_firmware — cpe:2.3:o:amd:ryzen_threadripper_3960x_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_3970x_firmware — cpe:2.3:o:amd:ryzen_threadripper_3970x_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5945wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5945wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5955wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5955wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5965wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5965wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5975wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5975wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_5995wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_5995wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_3990x_firmware — cpe:2.3:o:amd:ryzen_threadripper_3990x_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_3945wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_3945wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_3955wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_3955wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_3975wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_3975wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_threadripper_pro_3995wx_firmware — cpe:2.3:o:amd:ryzen_threadripper_pro_3995wx_firmware:-:*:*:*:*:*:*:*
amd ryzen_5600g_firmware — cpe:2.3:o:amd:ryzen_5600g_firmware:-:*:*:*:*:*:*:*
amd ryzen_5600ge_firmware — cpe:2.3:o:amd:ryzen_5600ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5425u_firmware — cpe:2.3:o:amd:ryzen_3_5425u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5400u_firmware — cpe:2.3:o:amd:ryzen_3_5400u_firmware:-:*:*:*:*:*:*:*
amd ryzen_5600x_firmware — cpe:2.3:o:amd:ryzen_5600x_firmware:-:*:*:*:*:*:*:*
amd ryzen_5700g_firmware — cpe:2.3:o:amd:ryzen_5700g_firmware:-:*:*:*:*:*:*:*
amd ryzen_5700ge_firmware — cpe:2.3:o:amd:ryzen_5700ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_5800x_firmware — cpe:2.3:o:amd:ryzen_5800x_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_5600h_firmware — cpe:2.3:o:amd:ryzen_5_5600h_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_5600hs_firmware — cpe:2.3:o:amd:ryzen_5_5600hs_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_5600u_firmware — cpe:2.3:o:amd:ryzen_5_5600u_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_5600x_firmware — cpe:2.3:o:amd:ryzen_5_5600x_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-26337

cvelogic Threat Intelligence