CVE-2023-20509
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 · uneditedAn insufficient DRAM address validation in PMFW may allow a privileged attacker to perform a DMA read from an invalid DRAM address to SRAM, potentially resulting in loss of data integrity.
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 confidenceThis is a vulnerability in AMD Power Management Firmware (PMFW) where insufficient validation of DRAM addresses allows a privileged attacker to perform DMA reads from invalid DRAM addresses to SRAM, potentially corrupting data integrity.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Local
- Complexity
- High
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:L
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.
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Identify AMD hardware in the systemUse commands like 'lspci', 'dmidecode', or 'cat /proc/cpuinfo' to verify the presence of AMD processors or AMD-based systemsAffected if The system does not contain AMD processors or AMD-based components (not applicable)
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Determine the Power Management Firmware (PMFW) versionAccess the system BIOS/UEFI settings or use vendor-specific tools (such as AMD's firmware tools or 'dmidecode -t bios') to retrieve the PMFW version; on some systems this may be listed as AGESA or PSP firmware versionAffected if The PMFW version cannot be retrieved or identified
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Compare installed PMFW version against known affected versionsCross-reference the detected PMFW version with AMD's official security advisory for CVE-2023-20509 to determine if it falls within the vulnerable version rangeAffected if The installed PMFW version is within the vulnerable version range per AMD's advisory
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Verify privileged access contextConfirm whether the attacker or compromised account has privileged (administrator/root) access required to perform DMA operationsAffected if The attacker does not have privileged access (vulnerability requires privileged attacker)
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Confirm DMA and SRAM access capabilityCheck system configuration and DMA-enabled devices to determine if SRAM read operations via DMA are possible from the firmware contextAffected if DMA operations to SRAM are not possible from the PMFW context
The system is affected if it runs AMD hardware with a PMFW version within the vulnerable range AND the attacker has privileged access to initiate DMA operations.
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 the vendor-supplied firmware update for PMFW that properly validates DRAM addresses before DMA operations, as this is a firmware-level vulnerability not addressable through configuration changes.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-20509 — 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-2023-20509 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
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- 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
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