CVE-2023-20540

mediumpriority · track · 0EPSS 0.002 · 4 %ileDEEURU

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.15% (4th) EPSS

CVSS 5.2 · medium

Is it mine?

21 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.

cvss

Technical severity, 0–10. One row per scoring source.

5.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 0.2–5.2

v3.15.2mediumAV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:Hsecondary · FSTEC (BDU) RU

v4.01.8lowCVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:Nsecondary · ENISA EU

v4.01.8lowCVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · psirt@amd.com

v4.00.2lowCVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-208USCWE-822US

affected products (21)

Products and version ranges known to be affected.

AMD Prozessor Athlonall versionscert_bundDEcpe:/h:amd:amd_processor:athlon
AMD Prozessor EPYCall versionscert_bundDEcpe:/h:amd:amd_processor:epyc
AMD Prozessor EPYC 7272 CPU on SEVall versionscert_bundDEcpe:/h:amd:amd_processor:epyc_7272_cpu_on_sev
AMD Prozessor EPYC Embeddedall versionscert_bundDEcpe:/h:amd:amd_processor:epyc_embedded
AMD Prozessor Ryzenall versionscert_bundDEcpe:/h:amd:amd_processor:ryzen
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Dell Computerall versionscert_bundDEcpe:/o:dell:dell_computer:-
Dell PowerEdgeall versionscert_bundDEcpe:/h:dell:poweredge:-
HP Computerall versionscert_bundDEcpe:/h:hp:computer:-
HPE ProLiantall versionscert_bundDEcpe:/h:hp:proliant:-
Lenovo Computerall versionscert_bundDEcpe:/h:lenovo:computer:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
AMD AMD Ryzen™ 3000 Series Desktop Processors< ComboAM4 1.0.0.Eenisa_euvdEU
AMD AMD Ryzen™ 3000 Series Desktop Processors< ComboAM4v2PI 1.2.0.CAenisa_euvdEU
AMD AMD Ryzen™ 5000 Series Desktop Processors< ComboAM4v2PI 1.2.0.CAenisa_euvdEU
AMD AMD Ryzen™ Threadripper™ 3000 Series Processors< CastlePeakPI-SP3r3 1.0.0.Cenisa_euvdEU
AMD AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors< CastlePeakWSPI-sWRX8 1.0.0.Eenisa_euvdEU
AMD AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processors< ChagallWSPI-sWRX8 1.0.0.9enisa_euvdEU
Advanced Micro Devices Inc. AMD Ryzen Embedded 5000≤ EmbAM4PI 1.0.0.5fstec_bduRU

showing 20 of 21

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1770AMD Prozessoren: Mehrere SchwachstellenDeutsch2025-08-12csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in AMD Prozessoren ausnutzen, um Sicherheitsmaßnahmen zu umgehen, erweiterte Privilegien zu erlangen, beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu verursachen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder nicht näher spezifizierte Angriffe durchzuführen.
WID-SEC-W-2026-0381AMD EPYC, Athlon und Ryzen Prozessoren: Mehrere SchwachstellenDeutsch2026-02-10csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in AMD Prozessor ausnutzen, um beliebigen Code auszuführen, sich erhöhte Berechtigungen zu verschaffen, Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand herbeizuführen, vertrauliche Informationen offenzulegen oder Daten zu manipulieren.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2026-06-26modified 2026-06-26

references (3)

External citations — patches, advisories, analysis.

scry

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