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NVD / CVE Program· CNA AMD

CVE-2021-46772: Insufficient input validation in the ABL may allow a privileged attacker with access to the BIOS menu or UEFI shell to tamper with the struc

Noroxi assessment

Priority: Monitor (action score 15/100)

  • 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: 0.18% (FIRST EPSS).
  • Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. Special conditions such as timing or configuration are required.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

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

Insufficient input validation in the ABL may allow a privileged attacker with access to the BIOS menu or UEFI shell to tamper with the structure headers in SPI ROM causing an out of bounds memory read and write, potentially resulting in memory corruption or denial of service.

LowCVSS 3.9 · v3.1—No exploit No fix recorded
Published
Aug 13, 2024
Updated
Jun 17, 2026
EPSS
0.1% · 7th percentile

Report tools

JSON

Action score

15

Monitor

Low priority for now.

CVSS
15 / 40 · 3.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · AMD
3.9
NVD has not scored this yet; the score shown is the CNA’s.

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
  • No fixed version yet

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

Follow CVE-2021-46772

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.

—

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 AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics

    • variousaffected

  • AMD AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics

    • various, variousaffected

  • AMD AMD EPYC™ 7002 Series Processors

    • RomePI 1.0.0.Enot affected

  • AMD AMD EPYC™ 7003 Series Processors

    • MilanPI 1.0.0.9not affected

  • AMD AMD EPYC™ Embedded 7002 Series Processors

    • EmbRomePI-SP3 1.0.0.8not affected

  • AMD AMD EPYC™ Embedded 7003 Series Processors

    • EmbMilanPI-SP3 1.0.0.5not affected

  • AMD AMD Ryzen™ 3000 Series Desktop Processors

    • variousaffected

  • AMD AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics

    • variousaffected

  • AMD AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics

    • CezannePI-FP6 1.0.0.Enot affected

  • AMD AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics

    • variousaffected

  • AMD AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics

    • variousaffected

  • AMD AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics

    • ComboAM4V2 1.2.0.Aaffected

Same product

amd: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-20599Improper register access control in ASP may allow a privileged attacker to perform unauthorized access to ASP’s Crypto Co-Processor (CCP) re
    31Monitor
  • CVE-2025-54518Improper isolation of shared resources within the CPU operation cache on Zen 2-based products could allow an attacker to corrupt instruction
    29Monitor
  • CVE-2024-21961Improper restriction of operations within the bounds of a memory buffer in PCIe® Link could allow an attacker with access to a guest virtual
    24Monitor

Published before and after this one in the same product

  • Later →CVE-2024-36348Jul 8, 2025 · A transient execution vulnerability in some AMD processors may allow a user process to infer the control registers speculatively even if UMI
    15Monitor
  • Later →CVE-2024-36349Jul 8, 2025 · A transient execution vulnerability in some AMD processors may allow a user process to infer TSC_AUX even when such a read is disabled, pote
    15Monitor

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

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.
  • Administrator privileges are required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality impact
None
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (2 more)

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

All records