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CVE-2021-26366· NVD / CVE Program· CNA AMD

An attacker, who gained elevated privileges via some other vulnerability, may be able to read data from Boot ROM resulting in a loss of syst

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.23% (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.
  • 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

An attacker, who gained elevated privileges via some other vulnerability, may be able to read data from Boot ROM resulting in a loss of system integrity.

HighCVSS 7.1 · v3.1—No exploit No fix recorded
Published
May 12, 2022
Updated
Jun 16, 2026
EPSS
0.2% · 13th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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-2021-26366

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
amdradeon software
amdathlon 3050ge firmware
amdathlon 3050ge
amdathlon 3150g firmware
amdathlon 3150g
amdathlon 3150ge firmware
amdathlon 3150ge
amdryzen 3 2200u firmware
amdryzen 3 2200u
amdryzen 3 2300u firmware
amdryzen 3 2300u
amdryzen 3 3100 firmware

and 113 more

Affected versions

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

  • amd athlon 3050ge firmwareall versions
  • amd athlon 3150g firmwareall versions
  • amd athlon 3150ge firmwareall versions
  • amd radeon softwareall versions
  • amd ryzen 3 2200u firmwareall versions
  • amd ryzen 3 2300u firmwareall versions
  • amd ryzen 3 3100 firmwareall versions
  • amd ryzen 3 3300g firmwareall versions
  • amd ryzen 3 3300x firmwareall versions
  • amd ryzen 3 5125c firmwareall versions
  • amd ryzen 3 5400u firmwareall versions
  • amd ryzen 3 5425c firmwareall versions
  • amd ryzen 3 5425u firmwareall versions
  • amd ryzen 5 2500u firmwareall versions
  • amd ryzen 5 2600 firmwareall versions
  • amd ryzen 5 2600h firmwareall versions
  • amd ryzen 5 2600x firmwareall versions
  • amd ryzen 5 3400g firmwareall versions
  • amd ryzen 5 3450g firmwareall versions
  • amd ryzen 5 3600 firmwareall versions

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 Athlon™ Series

    • variousaffected

  • AMD Ryzen™ Series

    • variousaffected

Same product

amd: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-20586Radeon™ Software Crimson ReLive Edition
    39Monitor
  • CVE-2024-21937Incorrect default permissions in the AMD HIP SDK installation directory could allow an attacker to achieve privilege escalation potentially
    31Monitor
  • CVE-2023-20598 An improper privilege management in the AMD Radeon™ Graphics driver may allow an authenticated attacker to craft an IOCTL request to gain
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-26361May 12, 2022 · A malicious or compromised User Application (UApp) or AGESA Boot Loader (ABL) could be used by an attacker to exfiltrate arbitrary memory fr
    22Monitor
  • ← EarlierCVE-2021-26362May 12, 2022 · A malicious or compromised UApp or ABL may be used by an attacker to issue a malformed system call which results in mapping sensitive System
    28Monitor
  • Later →CVE-2021-26369May 12, 2022 · A malicious or compromised UApp or ABL may be used by an attacker to send a malformed system call to the bootloader, resulting in out-of-bou
    31Monitor

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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

Weakness class (CWE)

—

CVSS vector

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

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

References

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

All records