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CVE-2023-20573· NVD / CVE Program· CNA AMD

Debug Exception Delivery in Secure Nested Paging

Noroxi assessment

Priority: Monitor (action score 12/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.28% (FIRST EPSS).
  • Someone with local access to the system can trigger it. Administrator privileges are required. 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

A privileged attacker can prevent delivery of debug exceptions to SEV-SNP guests potentially resulting in guests not receiving expected debug information.

LowCVSS 3.2 · v3.1—Proof of concept No fix recorded
Published
Jan 11, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

12

Monitor

Low priority for now.

CVSS
12 / 40 · 3.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • No fixed version yet

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

Follow CVE-2023-20573

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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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 7763 firmware
amdepyc 7763
amdepyc 7713p firmware
amdepyc 7713p
amdepyc 7713 firmware
amdepyc 7713
amdepyc 7663p firmware
amdepyc 7663p
amdepyc 7663 firmware
amdepyc 7663
amdepyc 7643p firmware
amdepyc 7643p

and 118 more

Affected versions

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

  • amd epyc 7203 firmwareall versions
  • amd epyc 7203p firmwareall versions
  • amd epyc 72f3 firmwareall versions
  • amd epyc 7303 firmwareall versions
  • amd epyc 7303p firmwareall versions
  • amd epyc 7313 firmwareall versions
  • amd epyc 7313p firmwareall versions
  • amd epyc 7343 firmwareall versions
  • amd epyc 7373x firmwareall versions
  • amd epyc 73f3 firmwareall versions
  • amd epyc 7413 firmwareall versions
  • amd epyc 7443 firmwareall versions
  • amd epyc 7443p firmwareall versions
  • amd epyc 7453 firmwareall versions
  • amd epyc 7473x firmwareall versions
  • amd epyc 74f3 firmwareall versions
  • amd epyc 7513 firmwareall versions
  • amd epyc 7543 firmwareall versions
  • amd epyc 7543p firmwareall versions
  • amd epyc 7573x 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 3rd Gen AMD EPYC™ Processors

    • variousaffected

  • AMD 4th Gen AMD EPYC™ Processors

    • Variousaffected

Same product

amd: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-46771Insufficient validation of addresses in AMD Secure Processor (ASP) firmware system call may potentially lead to arbitrary code execution by
    31Monitor
  • CVE-2021-26353Failure to validate inputs in SMM may allow an attacker to create a mishandled error leaving the DRTM UApp in a partially initialized state
    31Monitor
  • CVE-2021-26324A bug with the SEV-ES TMR may lead to a potential loss of memory integrity for SNP-active VMs.
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-26348May 11, 2022 · Failure to flush the Translation Lookaside Buffer (TLB) of the I/O memory management unit (IOMMU) may lead an IO device to write to memory i
    22Monitor
  • ← EarlierCVE-2021-26349May 11, 2022 · Failure to assign a new report ID to an imported guest may potentially result in an SEV-SNP guest VM being tricked into trusting a dishonest
    22Monitor
  • ← EarlierCVE-2023-20566Nov 14, 2023 · Improper address validation in ASP with SNP enabled may potentially allow an attacker to compromise guest memory integrity.
    30Monitor

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

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:62023-03-11

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.

  1. First PoC-306 d
  2. Published
  3. TodayOct 21, 2026+1014 d
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.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

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

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

Weakness class (CWE)

CWE-693 · Protection Mechanism Failure

CVSS vector

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

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