CVE-2023-20531
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedInsufficient bound checks in the SMU may allow an attacker to update the SRAM from/to address space to an invalid value potentially resulting in a denial of service.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceInsufficient bound checks in AMD's System Management Unit (SMU) allow an attacker to update SRAM from/to address space to invalid values, potentially causing denial of service through system instability or crash.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< romepi_1.0.0.c< romepi_1.0.0.c< romepi_1.0.0.c< romepi_1.0.0.c< romepi_1.0.0.c< romepi_1.0.0.c< romepi_1.0.0.c< romepi_1.0.0.cCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Identify the AMD Epyc processor modelRun 'dmidecode -t processor | grep -E "(Version|Model)"' or check BIOS/processor information to confirm the exact Epyc model number (e.g., 7h12, 7f72, 7742, 7702, 7662)Affected if The processor is one of the listed Epyc models (7h12, 7f72, 7f52, 7f32, 7742, 7702p, 7702, or 7662)
-
Retrieve the SMU firmware versionUse AMD-specific tools such as 'amd_smu_info' if available, or check via IPMI/BMC using 'ipmi-fru' or redfish endpoints at /redfish/v1/Managers/1/FirmwareInventory, or inspect BIOS firmware version strings accessible through 'dmidecode -t bios'Affected if The SMU firmware version string contains 'romepi' and the version is less than '1.0.0.c' (e.g., earlier builds of the same firmware branch)
-
Compare against the vulnerable version identifierLocate the firmware version string from step 2 and compare it lexicographically or numerically to 'romepi_1.0.0.c' - note that version strings may appear in formats like 'romepi-x.x.x' or similar firmware branch namingAffected if The installed firmware version is earlier than romepi_1.0.0.c, meaning the version comparison indicates a build prior to the fix
-
Verify the SMU is accessible and operationalConfirm the System Management Unit is functioning by checking system management logs via 'dmesg | grep -i smu' or IPMI system event logs, as the vulnerability requires SMU write access to SRAM address spaceAffected if The SMU is enabled, running, and writable - meaning the system actually uses the vulnerable SMU firmware for power management or other functions
-
Check for recent firmware updatesQuery the BMC/BIOS for the last firmware update timestamp using 'bmc-info' or check /sys/class/dmi/id/* for bios revision dates, or review AMD's advisory for the specific Epyc model to see if an update has been appliedAffected if No firmware update addressing CVE-2023-20531 has been applied, or the firmware version remains in the vulnerable state
A user is affected if they are running any of the listed AMD Epyc 7002 series processors (7h12, 7f72, 7f52, 7f32, 7742, 7702p, 7702, 7662) with SMU firmware versions earlier than romepi_1.0.0.c, where the SMU is active and accessible.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply AMD-provided firmware/microcode updates that address the SMU bound check vulnerability. Consult AMD's product security advisories for affected product families and update procedures.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-20531 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-20531 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data