CVE record · CVE-2021-26371

A compromised or malicious ABL or UApp could send a SHA256 system call to the bootloader, which may result in exposure of ASP memory to userspace, potentially leading to information disclosure.

CVSS 5.5 MediumEPSS 0.0019 · 8th percentile

Published by the CVE Program (CNA: AMD) at 9 May 2023, 18:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
AMD	Ryzen™ 2000 series Desktop Processors “Raven Ridge” AM4 Package name: AGESA	affected various Other versions: unaffected
AMD	Ryzen™ 3000 Series Desktop Processors “Matisse” AM4 Package name: AGESA	affected various Other versions: unaffected
AMD	AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4 Package name: AGESA	affected various Other versions: unaffected
AMD	3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT Package name: AGESA	affected various Other versions: unaffected
AMD	Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS Package name: AGESA	affected various Other versions: unaffected
AMD	Ryzen™ Threadripper™ PRO Processors “Chagall” WS Package name: AGESA	affected various Other versions: unaffected
AMD	Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” ULP Package name: AGESA	affected various Other versions: unaffected
AMD	Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock” Package name: AGESA	affected various Other versions: unaffected
AMD	Ryzen™ 2000 Series Mobile Processors “Raven Ridge” FP5 Package name: AGESA	affected various Other versions: unaffected
AMD	Ryzen™ 3000 Series Mobile processor, 2nd Gen AMD Ryzen™ Mobile Processors with Radeon™ Graphics “Picasso” Package name: AGESA	affected various Other versions: unaffected
AMD	1st Gen AMD EPYC™ Processors Package name: AGESA	affected various Other versions: unaffected
AMD	2nd Gen AMD EPYC™ Processors Package name: AGESA	affected various Other versions: unaffected
AMD	3rd Gen AMD EPYC™ Processors Package name: AGESA	affected various Other versions: unaffected

Identifiers: CVE-2021-26371
CNA: AMD
Tags: AMD Ryzen™ 2000 series Desktop Processors “Raven Ridge” AM4
AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4
AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4
3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT
AMD Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS
AMD Ryzen™ Threadripper™ PRO Processors “Chagall” WS
AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” ULP
AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock”
Published: 9 May 2023
Updated: 28 Jan 2025

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.5	Medium	3.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	ADP (CISA-ADP)

CISA KEV Not listed.
EPSS 0.0019, the 8th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 9 May 2023. New records show when each source confirmed them.

Sources

References from the CNA

www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001 vendor-advisory
www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001 vendor-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.