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NVD / CVE Program· CNA AMD

CVE-2021-46766: Improper clearing of sensitive data in the ASP Bootloader may expose secret keys to a privileged attacker accessing ASP SRAM, potentially…

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: kernel-firmware (openSUSE:Leap 15.5) 20230724-150500.3.9.1; kernel-firmware (openSUSE:Leap Micro 5.3) 20220509-150400.4.25.1; kernel-firmware (SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS) 20200107-150100.3.40.1.
  • Severity is disputed: the assigning authority (CNA) scores it 2.5, NVD 5.5.

Low priority for now. Upgrade to kernel-firmware (openSUSE:Leap 15.5) 20230724-150500.3.9.1; kernel-firmware (openSUSE:Leap Micro 5.3) 20220509-150400.4.25.1; kernel-firmware (SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS) 20200107-150100.3.40.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper clearing of sensitive data in the ASP Bootloader may expose secret keys to a privileged attacker accessing ASP SRAM, potentially leading to a loss of confidentiality.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Nov 14, 2023
Updated
Jun 17, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
5.5
CNA · AMD
2.5
3.0 point gap

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-46766

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
amdepyc 9654p firmware
amdepyc 9654p
amdepyc 9654 firmware
amdepyc 9654
amdepyc 9634 firmware
amdepyc 9634
amdepyc 9554p firmware
amdepyc 9554p
amdepyc 9554 firmware
amdepyc 9554
amdepyc 9534 firmware
amdepyc 9534

and 44 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • amd epyc 9124 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9174f firmwarebefore genoapi_1.0.0.4
  • amd epyc 9184x firmwarebefore genoapi_1.0.0.4
  • amd epyc 9224 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9254 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9274f firmwarebefore genoapi_1.0.0.4
  • amd epyc 9334 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9354 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9354p firmwarebefore genoapi_1.0.0.4
  • amd epyc 9374f firmwarebefore genoapi_1.0.0.4
  • amd epyc 9384x firmwarebefore genoapi_1.0.0.4
  • amd epyc 9454 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9454p firmwarebefore genoapi_1.0.0.4
  • amd epyc 9474f firmwarebefore genoapi_1.0.0.4
  • amd epyc 9534 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9554 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9554p firmwarebefore genoapi_1.0.0.4
  • amd epyc 9634 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9654 firmwarebefore genoapi_1.0.0.4
  • amd epyc 9654p firmwarebefore genoapi_1.0.0.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (AMD). Independent of NVD's CPE analysis and usually ahead of it.

  • AMD 4th Gen AMD EPYC™ Processors

    • variousaffected

  • AMD AMD EPYC™ Embedded 9003

    • variousaffected

  • AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors “Chagall” WS

    • variousaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 15.5kernel-firmwarebefore 20230724-150500.3.9.120230724-150500.3.9.1
openSUSE:Leap Micro 5.3kernel-firmwarebefore 20220509-150400.4.25.120220509-150400.4.25.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSkernel-firmwarebefore 20200107-150100.3.40.120200107-150100.3.40.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSkernel-firmwarebefore 20210208-150300.4.19.120210208-150300.4.19.1
SUSE:Linux Enterprise Micro 5.3kernel-firmwarebefore 20220509-150400.4.25.120220509-150400.4.25.1
SUSE:Linux Enterprise Micro 5.5kernel-firmwarebefore 20230724-150500.3.9.120230724-150500.3.9.1
SUSE:Linux Enterprise Server 12 SP5kernel-firmwarebefore 20190618-5.34.120190618-5.34.1

Same product

amd: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-23830SMM configuration may not be immutable, as intended, when SNP is enabled resulting in a potential limited loss of guest memory integrity.
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:kernel-firmware20230724-150500.3.9.1 · openSUSE:Leap 15.5Package registry (OSV)
suse:kernel-firmware20210208-150300.4.19.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSPackage registry (OSV)
suse:kernel-firmware20230724-150500.3.9.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-459 · Incomplete Cleanup

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records