CVE-2021-46778

Execution unit scheduler contention may lead to a side channel vulnerability found on AMD CPU microarchitectures codenamed “Zen 1”, “Zen 2” and “Zen 3” that use simultaneous multithreading (SMT). By measuring the contention level on scheduler queues an attacker may potentially leak sensitive information.

Published: 2022-08-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-46778 is rated Low Risk (30.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.09%). 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-2021-46778

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 2025-03-17 0.04% 0.09% +0.05%
2 2023-03-07 1.04% 0.04% -0.99%
3 2022-08-20 — 1.04% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-46778

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.6 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.
 1.1 4.0 [email protected]

Weakness enumeration for CVE-2021-46778

OS Trackers for CVE-2021-46778

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2021-46778
suse medium — https://www.suse.com/security/cve/CVE-2021-46778/

Affected software / configurations for CVE-2021-46778

Vendor Product Version Raw CPE
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 epyc_7001_firmware — cpe:2.3:o:amd:epyc_7001_firmware:-:*:*:*:*:*:*:*
amd epyc_7002_firmware — cpe:2.3:o:amd:epyc_7002_firmware:-:*:*:*:*:*:*:*
amd epyc_7003_firmware — cpe:2.3:o:amd:epyc_7003_firmware:-:*:*:*:*:*:*:*
amd epyc_7232p_firmware — cpe:2.3:o:amd:epyc_7232p_firmware:-:*:*:*:*:*:*:*
amd epyc_7251_firmware — cpe:2.3:o:amd:epyc_7251_firmware:-:*:*:*:*:*:*:*
amd epyc_7252_firmware — cpe:2.3:o:amd:epyc_7252_firmware:-:*:*:*:*:*:*:*
amd epyc_7261_firmware — cpe:2.3:o:amd:epyc_7261_firmware:-:*:*:*:*:*:*:*
amd epyc_7262_firmware — cpe:2.3:o:amd:epyc_7262_firmware:-:*:*:*:*:*:*:*
amd epyc_7272_firmware — cpe:2.3:o:amd:epyc_7272_firmware:-:*:*:*:*:*:*:*
amd epyc_7281_firmware — cpe:2.3:o:amd:epyc_7281_firmware:-:*:*:*:*:*:*:*
amd epyc_7282_firmware — cpe:2.3:o:amd:epyc_7282_firmware:-:*:*:*:*:*:*:*
amd epyc_72f3_firmware — cpe:2.3:o:amd:epyc_72f3_firmware:-:*:*:*:*:*:*:*
amd epyc_7301_firmware — cpe:2.3:o:amd:epyc_7301_firmware:-:*:*:*:*:*:*:*
amd epyc_7302_firmware — cpe:2.3:o:amd:epyc_7302_firmware:-:*:*:*:*:*:*:*
amd epyc_7302p_firmware — cpe:2.3:o:amd:epyc_7302p_firmware:-:*:*:*:*:*:*:*
amd epyc_7313_firmware — cpe:2.3:o:amd:epyc_7313_firmware:-:*:*:*:*:*:*:*
amd epyc_7313p_firmware — cpe:2.3:o:amd:epyc_7313p_firmware:-:*:*:*:*:*:*:*
amd epyc_7343_firmware — cpe:2.3:o:amd:epyc_7343_firmware:-:*:*:*:*:*:*:*
amd epyc_7351_firmware — cpe:2.3:o:amd:epyc_7351_firmware:-:*:*:*:*:*:*:*
amd epyc_7351p_firmware — cpe:2.3:o:amd:epyc_7351p_firmware:-:*:*:*:*:*:*:*
amd epyc_7352_firmware — cpe:2.3:o:amd:epyc_7352_firmware:-:*:*:*:*:*:*:*
amd epyc_7371_firmware — cpe:2.3:o:amd:epyc_7371_firmware:-:*:*:*:*:*:*:*
amd epyc_7373x_firmware — cpe:2.3:o:amd:epyc_7373x_firmware:-:*:*:*:*:*:*:*
amd epyc_73f3_firmware — cpe:2.3:o:amd:epyc_73f3_firmware:-:*:*:*:*:*:*:*
amd epyc_7401_firmware — cpe:2.3:o:amd:epyc_7401_firmware:-:*:*:*:*:*:*:*
amd epyc_7401p_firmware — cpe:2.3:o:amd:epyc_7401p_firmware:-:*:*:*:*:*:*:*
amd epyc_7402_firmware — cpe:2.3:o:amd:epyc_7402_firmware:-:*:*:*:*:*:*:*
amd epyc_7402p_firmware — cpe:2.3:o:amd:epyc_7402p_firmware:-:*:*:*:*:*:*:*
amd epyc_7413_firmware — cpe:2.3:o:amd:epyc_7413_firmware:-:*:*:*:*:*:*:*
amd epyc_7443_firmware — cpe:2.3:o:amd:epyc_7443_firmware:-:*:*:*:*:*:*:*
amd epyc_7443p_firmware — cpe:2.3:o:amd:epyc_7443p_firmware:-:*:*:*:*:*:*:*
amd epyc_7451_firmware — cpe:2.3:o:amd:epyc_7451_firmware:-:*:*:*:*:*:*:*
amd epyc_7452_firmware — cpe:2.3:o:amd:epyc_7452_firmware:-:*:*:*:*:*:*:*
amd epyc_7453_firmware — cpe:2.3:o:amd:epyc_7453_firmware:-:*:*:*:*:*:*:*
amd epyc_7473x_firmware — cpe:2.3:o:amd:epyc_7473x_firmware:-:*:*:*:*:*:*:*
amd epyc_74f3_firmware — cpe:2.3:o:amd:epyc_74f3_firmware:-:*:*:*:*:*:*:*
amd epyc_7501_firmware — cpe:2.3:o:amd:epyc_7501_firmware:-:*:*:*:*:*:*:*
amd epyc_7502_firmware — cpe:2.3:o:amd:epyc_7502_firmware:-:*:*:*:*:*:*:*
amd epyc_7502p_firmware — cpe:2.3:o:amd:epyc_7502p_firmware:-:*:*:*:*:*:*:*
amd epyc_7513_firmware — cpe:2.3:o:amd:epyc_7513_firmware:-:*:*:*:*:*:*:*
amd epyc_7532_firmware — cpe:2.3:o:amd:epyc_7532_firmware:-:*:*:*:*:*:*:*
amd epyc_7542_firmware — cpe:2.3:o:amd:epyc_7542_firmware:-:*:*:*:*:*:*:*
amd epyc_7543_firmware — cpe:2.3:o:amd:epyc_7543_firmware:-:*:*:*:*:*:*:*
amd epyc_7543p_firmware — cpe:2.3:o:amd:epyc_7543p_firmware:-:*:*:*:*:*:*:*
amd epyc_7551_firmware — cpe:2.3:o:amd:epyc_7551_firmware:-:*:*:*:*:*:*:*
amd epyc_7551p_firmware — cpe:2.3:o:amd:epyc_7551p_firmware:-:*:*:*:*:*:*:*
amd epyc_7552_firmware — cpe:2.3:o:amd:epyc_7552_firmware:-:*:*:*:*:*:*:*
amd epyc_7573x_firmware — cpe:2.3:o:amd:epyc_7573x_firmware:-:*:*:*:*:*:*:*
amd epyc_75f3_firmware — cpe:2.3:o:amd:epyc_75f3_firmware:-:*:*:*:*:*:*:*
amd epyc_7601_firmware — cpe:2.3:o:amd:epyc_7601_firmware:-:*:*:*:*:*:*:*
amd epyc_7642_firmware — cpe:2.3:o:amd:epyc_7642_firmware:-:*:*:*:*:*:*:*
amd epyc_7643_firmware — cpe:2.3:o:amd:epyc_7643_firmware:-:*:*:*:*:*:*:*
amd epyc_7662_firmware — cpe:2.3:o:amd:epyc_7662_firmware:-:*:*:*:*:*:*:*
amd epyc_7663_firmware — cpe:2.3:o:amd:epyc_7663_firmware:-:*:*:*:*:*:*:*
amd epyc_7702_firmware — cpe:2.3:o:amd:epyc_7702_firmware:-:*:*:*:*:*:*:*
amd epyc_7702p_firmware — cpe:2.3:o:amd:epyc_7702p_firmware:-:*:*:*:*:*:*:*
amd epyc_7713_firmware — cpe:2.3:o:amd:epyc_7713_firmware:-:*:*:*:*:*:*:*
amd epyc_7713p_firmware — cpe:2.3:o:amd:epyc_7713p_firmware:-:*:*:*:*:*:*:*
amd epyc_7742_firmware — cpe:2.3:o:amd:epyc_7742_firmware:-:*:*:*:*:*:*:*
amd epyc_7763_firmware — cpe:2.3:o:amd:epyc_7763_firmware:-:*:*:*:*:*:*:*
amd epyc_7773x_firmware — cpe:2.3:o:amd:epyc_7773x_firmware:-:*:*:*:*:*:*:*
amd epyc_7f32_firmware — cpe:2.3:o:amd:epyc_7f32_firmware:-:*:*:*:*:*:*:*
amd epyc_7f52_firmware — cpe:2.3:o:amd:epyc_7f52_firmware:-:*:*:*:*:*:*:*
amd epyc_7f72_firmware — cpe:2.3:o:amd:epyc_7f72_firmware:-:*:*:*:*:*:*:*
amd epyc_7h12_firmware — cpe:2.3:o:amd:epyc_7h12_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_3100_firmware — cpe:2.3:o:amd:ryzen_3_3100_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3200u_firmware — cpe:2.3:o:amd:ryzen_3_3200u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3250u_firmware — cpe:2.3:o:amd:ryzen_3_3250u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3300g_firmware — cpe:2.3:o:amd:ryzen_3_3300g_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3300u_firmware — cpe:2.3:o:amd:ryzen_3_3300u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3300x_firmware — cpe:2.3:o:amd:ryzen_3_3300x_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3350u_firmware — cpe:2.3:o:amd:ryzen_3_3350u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3450u_firmware — cpe:2.3:o:amd:ryzen_3_3450u_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3500c_firmware — cpe:2.3:o:amd:ryzen_3_3500c_firmware:-:*:*:*:*:*:*:*
amd ryzen_3_3500u_firmware — cpe:2.3:o:amd:ryzen_3_3500u_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-46778

cvelogic Threat Intelligence