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Epyc 7763 Firmware CVE-2023-20594

MEDIUM
Access of Uninitialized Pointer (CWE-824)
2023-09-20 psirt@amd.com
Information Disclosure Memory Corruption Amd Epyc 7763 Firmware Epyc 7713P Firmware Epyc 7713 Firmware Epyc 7663 Firmware Epyc 7773X Firmware Epyc 7643 Firmware Epyc 7573X Firmware Epyc 75F3 Firmware Epyc 7543P Firmware Epyc 7543 Firmware Epyc 7513 Firmware Epyc 7453 Firmware Epyc 74F3 Firmware Epyc 7443P Firmware Epyc 7443 Firmware Epyc 7413 Firmware Epyc 7373X Firmware Epyc 73F3 Firmware Epyc 7343 Firmware Epyc 7313P Firmware Epyc 7313 Firmware Epyc 72F3 Firmware Ryzen Threadripper 3960X Firmware Ryzen Threadripper 3970X Firmware Ryzen Threadripper 3990X Firmware Ryzen 3 3100 Firmware Ryzen 3 3300X Firmware Ryzen 3 3300U Firmware Ryzen 3 3250U Firmware Ryzen 3 3200U Firmware Ryzen 5 5600H Firmware Ryzen 5 5600Hs Firmware Ryzen 5 5625U Firmware Ryzen 5 5600U Firmware Ryzen 5 5500U Firmware Epyc 7003 Firmware Ryzen 3 3300G Firmware Ryzen 5 5560U Firmware Ryzen Threadripper Pro 3945Wx Firmware Ryzen Threadripper Pro 3955Wx Firmware Ryzen Threadripper Pro 3975Wx Firmware Ryzen Threadripper Pro 3995Wx Firmware Ryzen 5 5600X Firmware Ryzen 5 5625C Firmware Ryzen 5 5700G Firmware Ryzen 5 5700Ge Firmware Ryzen 5300G Firmware Ryzen 5300Ge Firmware Ryzen 5600G Firmware Ryzen 5600Ge Firmware Ryzen 5600X Firmware Ryzen 5700G Firmware Ryzen 5700Ge Firmware Ryzen 5800X Firmware Ryzen 5800X3D Firmware Ryzen 5900X Firmware Ryzen 5950X Firmware Ryzen 5 5600G Firmware Ryzen 5 5600Ge Firmware Ryzen 5 5600 Firmware Ryzen 5 5500 Firmware Ryzen Threadripper Pro 3795Wx Firmware Ryzen 3 3350U Firmware Ryzen 3 3450U Firmware Ryzen 3 3500U Firmware Ryzen 3 3500C Firmware Ryzen 3 3550H Firmware Ryzen 3 3580U Firmware Ryzen 3 3700U Firmware Ryzen 3 3700C Firmware Ryzen 3 3750H Firmware Ryzen 3 3780U Firmware Ryzen 3 3250C Firmware Ryzen 3 3200G Firmware Epyc 7743 Firmware Ryzen 3 3200Ge Firmware Ryzen 5500 Firmware Ryzen 5600 Firmware Ryzen 5700X Firmware Ryzen 5800 Firmware Ryzen 5900 Firmware Ryzen 5945Wx Firmware Ryzen 5955Wx Firmware Ryzen 5965Wx Firmware Ryzen 5975Wx Firmware Ryzen 5995Wx Firmware Ryzen 3100 Firmware Ryzen 3300X Firmware Ryzen 3500 Firmware Ryzen 3500X Firmware Ryzen 3600 Firmware Ryzen 3600X Firmware Ryzen 3600Xt Firmware Ryzen 3800X Firmware Ryzen 3800Xt Firmware Ryzen 3900 Firmware Ryzen 3900X Firmware Ryzen 3900Xt Firmware Ryzen 3950X Firmware Ryzen 6600H Firmware Ryzen 6600Hs Firmware Ryzen 6600U Firmware Ryzen 6800H Firmware Ryzen 6800Hs Firmware Ryzen 6800U Firmware Ryzen 6900Hs Firmware Ryzen 6900Hx Firmware Ryzen 6980Hs Firmware Ryzen 6980Hx Firmware Ryzen 3945Wx Firmware Ryzen 3955Wx Firmware Ryzen 3960X Firmware Ryzen 3970X Firmware Ryzen 3975Wx Firmware Ryzen 3990X Firmware Ryzen 3995Wx Firmware Ryzen 3 3300 Firmware Ryzen 5 5600X3D Firmware Ryzen 4700S Firmware Ryzen 4300G Firmware Ryzen 4300Ge Firmware Ryzen 4600G Firmware Ryzen 4600Ge Firmware Ryzen 4700G Firmware Ryzen 4700Ge Firmware
4.4
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Uninitialized pointer prevention
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 4.4 (MEDIUM). Attack characteristics: local attack vector, low complexity, high privileges required, no user interaction not required.

Exploit ScenarioDerived

Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAI

Improper initialization of variables in the DXE driver may allow a privileged user to leak sensitive information via local access. Rated medium severity (CVSS 4.4), this vulnerability is low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-824. Improper initialization of variables in the DXE driver may allow a privileged user to leak sensitive information via local access. Affected products include: Amd Epyc 7003 Firmware, Amd Epyc 72F3 Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313P Firmware, Amd Epyc 7343 Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 4.4 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

DescriptionNVD

Improper initialization of variables in the DXE driver may allow a privileged user to leak sensitive information via local access.

Threat Intelligence Overview

EPSS Score
0.2%
Top 93% exploitable
Data Quality
2 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:o:amd:epyc_7003_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_72f3_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313p_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7343_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7373x_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_73f3_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7413_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443p_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7453_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_74f3_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7513_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543p_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7573x_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_75f3_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7643_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7663_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7713_firmware:milanpi_1.0.0.a:*:*:*:*:*:*:*
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