CVE-2021-26340

A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation Lookaside Buffer (TLB) resulting in unexpected behavior inside the virtual machine (VM).

Published: 2021-12-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-26340 is rated Low Risk (38.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.24%). 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-2021-26340

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% 0.24% +0.18%
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-2021-26340

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.4 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/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: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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.0 5.8 [email protected]
3.6 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:P/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:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 4.9 [email protected]

Weakness enumeration for CVE-2021-26340

Affected software / configurations for CVE-2021-26340

Vendor Product Version Raw CPE
amd epyc_7001_firmware — cpe:2.3:o:amd:epyc_7001_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_7261_firmware — cpe:2.3:o:amd:epyc_7261_firmware:-:*:*:*:*:*:*:*
amd epyc_7252_firmware — cpe:2.3:o:amd:epyc_7252_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_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_7702p_firmware — cpe:2.3:o:amd:epyc_7702p_firmware:-:*:*:*:*:*:*:*
amd epyc_7702_firmware — cpe:2.3:o:amd:epyc_7702_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_7f32_firmware — cpe:2.3:o:amd:epyc_7f32_firmware:-:*:*:*:*:*:*:*
amd epyc_7f52_firmware — cpe:2.3:o:amd:epyc_7f52_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_7302_firmware — cpe:2.3:o:amd:epyc_7302_firmware:-:*:*:*:*:*:*:*
amd epyc_7301_firmware — cpe:2.3:o:amd:epyc_7301_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_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_7443p_firmware — cpe:2.3:o:amd:epyc_7443p_firmware:-:*:*:*:*:*:*:*
amd epyc_7443_firmware — cpe:2.3:o:amd:epyc_7443_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_7f72_firmware — cpe:2.3:o:amd:epyc_7f72_firmware:-:*:*:*:*:*:*:*
amd epyc_7h12_firmware — cpe:2.3:o:amd:epyc_7h12_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_3101_firmware — cpe:2.3:o:amd:epyc_embedded_3101_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_3151_firmware — cpe:2.3:o:amd:epyc_embedded_3151_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_3201_firmware — cpe:2.3:o:amd:epyc_embedded_3201_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_3251_firmware — cpe:2.3:o:amd:epyc_embedded_3251_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_3255_firmware — cpe:2.3:o:amd:epyc_embedded_3255_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_3351_firmware — cpe:2.3:o:amd:epyc_embedded_3351_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_3451_firmware — cpe:2.3:o:amd:epyc_embedded_3451_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7601_firmware — cpe:2.3:o:amd:epyc_embedded_7601_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7551_firmware — cpe:2.3:o:amd:epyc_embedded_7551_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7501_firmware — cpe:2.3:o:amd:epyc_embedded_7501_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7451_firmware — cpe:2.3:o:amd:epyc_embedded_7451_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7401_firmware — cpe:2.3:o:amd:epyc_embedded_7401_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7371_firmware — cpe:2.3:o:amd:epyc_embedded_7371_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7351_firmware — cpe:2.3:o:amd:epyc_embedded_7351_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7301_firmware — cpe:2.3:o:amd:epyc_embedded_7301_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7281_firmware — cpe:2.3:o:amd:epyc_embedded_7281_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7261_firmware — cpe:2.3:o:amd:epyc_embedded_7261_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_7251_firmware — cpe:2.3:o:amd:epyc_embedded_7251_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_755p_firmware — cpe:2.3:o:amd:epyc_embedded_755p_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_740p_firmware — cpe:2.3:o:amd:epyc_embedded_740p_firmware:-:*:*:*:*:*:*:*
amd epyc_embedded_735p_firmware — cpe:2.3:o:amd:epyc_embedded_735p_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-26340

cvelogic Threat Intelligence