CVE-2021-26316

Failure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resulting in potential SMM (System Management Mode) arbitrary code execution.

Published: 2023-01-11 Last update: 2025-04-09 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-26316 is rated Low Risk (37.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.06%). 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-2021-26316

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 2026-03-28 0.17% 0.06% -0.11%
2 2026-02-10 0.07% 0.17% +0.09%
3 2025-03-17 — 0.07% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-26316

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2021-26316

OS Trackers for CVE-2021-26316

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2021-26316

Affected software / configurations for CVE-2021-26316

Vendor Product Version Raw CPE
amd epyc_7h12_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7h12_firmware:*:*:*:*:*:*:*:*
amd epyc_7f72_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7f72_firmware:*:*:*:*:*:*:*:*
amd epyc_7f52_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7f52_firmware:*:*:*:*:*:*:*:*
amd epyc_7f32_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7f32_firmware:*:*:*:*:*:*:*:*
amd epyc_7742_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7742_firmware:*:*:*:*:*:*:*:*
amd epyc_7702p_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7702p_firmware:*:*:*:*:*:*:*:*
amd epyc_7702_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7702_firmware:*:*:*:*:*:*:*:*
amd epyc_7662_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7662_firmware:*:*:*:*:*:*:*:*
amd epyc_7642_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7642_firmware:*:*:*:*:*:*:*:*
amd epyc_7552_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7552_firmware:*:*:*:*:*:*:*:*
amd epyc_7542_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7542_firmware:*:*:*:*:*:*:*:*
amd epyc_7532_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7532_firmware:*:*:*:*:*:*:*:*
amd epyc_7502p_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7502p_firmware:*:*:*:*:*:*:*:*
amd epyc_7502_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7502_firmware:*:*:*:*:*:*:*:*
amd epyc_7452_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7452_firmware:*:*:*:*:*:*:*:*
amd epyc_7402_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7402_firmware:*:*:*:*:*:*:*:*
amd epyc_7402p_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7402p_firmware:*:*:*:*:*:*:*:*
amd epyc_7352_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7352_firmware:*:*:*:*:*:*:*:*
amd epyc_7302p_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7302p_firmware:*:*:*:*:*:*:*:*
amd epyc_7302_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7302_firmware:*:*:*:*:*:*:*:*
amd epyc_7282_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7282_firmware:*:*:*:*:*:*:*:*
amd epyc_7272_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7272_firmware:*:*:*:*:*:*:*:*
amd epyc_7262_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7262_firmware:*:*:*:*:*:*:*:*
amd epyc_7252_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7252_firmware:*:*:*:*:*:*:*:*
amd epyc_7232p_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7232p_firmware:*:*:*:*:*:*:*:*
amd epyc_7002_firmware < romepi_1.0.0.d cpe:2.3:o:amd:epyc_7002_firmware:*:*:*:*:*:*:*:*
amd epyc_7003_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7003_firmware:*:*:*:*:*:*:*:*
amd epyc_72f3_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7313_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7313_firmware:*:*:*:*:*:*:*:*
amd epyc_7313p_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7313p_firmware:*:*:*:*:*:*:*:*
amd epyc_7343_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7343_firmware:*:*:*:*:*:*:*:*
amd epyc_7373x_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7373x_firmware:*:*:*:*:*:*:*:*
amd epyc_73f3_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_73f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7413_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7413_firmware:*:*:*:*:*:*:*:*
amd epyc_7443_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7443_firmware:*:*:*:*:*:*:*:*
amd epyc_7443p_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7443p_firmware:*:*:*:*:*:*:*:*
amd epyc_7453_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7453_firmware:*:*:*:*:*:*:*:*
amd epyc_74f3_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_74f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7513_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7513_firmware:*:*:*:*:*:*:*:*
amd epyc_7543_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7543_firmware:*:*:*:*:*:*:*:*
amd epyc_7543p_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7543p_firmware:*:*:*:*:*:*:*:*
amd epyc_7573x_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7573x_firmware:*:*:*:*:*:*:*:*
amd epyc_75f3_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_75f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7643_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7643_firmware:*:*:*:*:*:*:*:*
amd epyc_7663_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7663_firmware:*:*:*:*:*:*:*:*
amd epyc_7713_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7713_firmware:*:*:*:*:*:*:*:*
amd epyc_7713p_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7713p_firmware:*:*:*:*:*:*:*:*
amd epyc_7743_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7743_firmware:*:*:*:*:*:*:*:*
amd epyc_7763_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7763_firmware:*:*:*:*:*:*:*:*
amd epyc_7773x_firmware < milanpi-sp3_1.0.0.8 cpe:2.3:o:amd:epyc_7773x_firmware:*:*:*:*:*:*:*:*
amd athlon_3050ge_firmware — cpe:2.3:o:amd:athlon_3050ge_firmware:-:*:*:*:*:*:*:*
amd athlon_3150g_firmware — cpe:2.3:o:amd:athlon_3150g_firmware:-:*:*:*:*:*:*:*
amd athlon_3150ge_firmware — cpe:2.3:o:amd:athlon_3150ge_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_3150c_firmware — cpe:2.3:o:amd:athlon_gold_3150c_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_3150ge_firmware — cpe:2.3:o:amd:athlon_gold_3150ge_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_3150u_firmware — cpe:2.3:o:amd:athlon_gold_3150u_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_pro_3150g_firmware — cpe:2.3:o:amd:athlon_gold_pro_3150g_firmware:-:*:*:*:*:*:*:*
amd athlon_gold_pro_3150ge_firmware — cpe:2.3:o:amd:athlon_gold_pro_3150ge_firmware:-:*:*:*:*:*:*:*
amd athlon_pro_3045b_firmware — cpe:2.3:o:amd:athlon_pro_3045b_firmware:-:*:*:*:*:*:*:*
amd athlon_pro_3145b_firmware — cpe:2.3:o:amd:athlon_pro_3145b_firmware:-:*:*:*:*:*:*:*
amd athlon_silver_3050c_firmware — cpe:2.3:o:amd:athlon_silver_3050c_firmware:-:*:*:*:*:*:*:*
amd athlon_silver_3050e_firmware — cpe:2.3:o:amd:athlon_silver_3050e_firmware:-:*:*:*:*:*:*:*
amd athlon_silver_3050ge_firmware — cpe:2.3:o:amd:athlon_silver_3050ge_firmware:-:*:*:*:*:*:*:*
amd athlon_silver_3050u_firmware — cpe:2.3:o:amd:athlon_silver_3050u_firmware:-:*:*:*:*:*:*:*
amd athlon_silver_pro_3125ge_firmware — cpe:2.3:o:amd:athlon_silver_pro_3125ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_2200g_firmware — cpe:2.3:o:amd:ryzen_3_2200g_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_2200ge_firmware — cpe:2.3:o:amd:ryzen_3_2200ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_2200u_firmware — cpe:2.3:o:amd:ryzen_3_2200u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_2300u_firmware — cpe:2.3:o:amd:ryzen_3_2300u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5125c_firmware — cpe:2.3:o:amd:ryzen_3_5125c_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5300g_firmware — cpe:2.3:o:amd:ryzen_3_5300g_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5300ge_firmware — cpe:2.3:o:amd:ryzen_3_5300ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5300u_firmware — cpe:2.3:o:amd:ryzen_3_5300u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5400u_firmware — cpe:2.3:o:amd:ryzen_3_5400u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5425c_firmware — cpe:2.3:o:amd:ryzen_3_5425c_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_5425u_firmware — cpe:2.3:o:amd:ryzen_3_5425u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_pro_2300u_firmware — cpe:2.3:o:amd:ryzen_3_pro_2300u_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_2400g_firmware — cpe:2.3:o:amd:ryzen_5_2400g_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_2400ge_firmware — cpe:2.3:o:amd:ryzen_5_2400ge_firmware:-:*:*:*:*:*:*:*
amd ryzen_5_2500u_firmware — cpe:2.3:o:amd:ryzen_5_2500u_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-26316

cvelogic Threat Intelligence