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Epyc 7763 Firmware CVE-2024-21978

HIGH
Improper Input Validation (CWE-20)
2024-08-05 psirt@amd.com
Information Disclosure Amd Epyc 7763 Firmware Epyc 7713P Firmware Epyc 7713 Firmware Epyc 7663P Firmware Epyc 7663 Firmware Epyc 7643P Firmware Epyc 7773X Firmware Epyc 7643 Firmware Epyc 7573X Firmware Epyc 75F3 Firmware Epyc 7543P Firmware Epyc 7543 Firmware Epyc 7513 Firmware Epyc 7473X 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 7303P Firmware Epyc 7303 Firmware Epyc 72F3 Firmware Epyc 7203P Firmware Epyc 7203 Firmware Epyc 9654P Firmware Epyc 9654 Firmware Epyc 9634 Firmware Epyc 9554P Firmware Epyc 9554 Firmware Epyc 9534 Firmware Epyc 9474F Firmware Epyc 9454P Firmware Epyc 9454 Firmware Epyc 9374F Firmware Epyc 9354P Firmware Epyc 9354 Firmware Epyc 9334 Firmware Epyc 9274F Firmware Epyc 9254 Firmware Epyc 9224 Firmware Epyc 9174F Firmware Epyc 9124 Firmware Epyc 9684X Firmware Epyc 9384X Firmware Epyc 9184X Firmware Epyc 9754 Firmware Epyc 9754S Firmware Epyc 9734 Firmware Epyc 8534P Firmware Epyc 8534Pn Firmware Epyc 8434P Firmware Epyc 8434Pn Firmware Epyc 8324P Firmware Epyc 8324Pn Firmware Epyc 8224P Firmware Epyc 8224Pn Firmware Epyc 8124P Firmware Epyc 8124Pn Firmware Epyc 8024P Firmware Epyc 8024Pn Firmware Epyc Embedded 7313 Firmware Epyc Embedded 7313P Firmware Epyc Embedded 7413 Firmware Epyc Embedded 7443 Firmware Epyc Embedded 7443P Firmware Epyc Embedded 7543 Firmware Epyc Embedded 7543P Firmware Epyc Embedded 7643 Firmware Epyc Embedded 7713 Firmware Epyc Embedded 7713P Firmware Epyc Embedded 9124 Firmware Epyc Embedded 9254 Firmware Epyc Embedded 9354 Firmware Epyc Embedded 9354P Firmware Epyc Embedded 9454 Firmware Epyc Embedded 9454P Firmware Epyc Embedded 9534 Firmware Epyc Embedded 9554 Firmware Epyc Embedded 9554P Firmware Epyc Embedded 9654 Firmware Epyc Embedded 9654P Firmware
7.9
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 7.9 (HIGH). Attack characteristics: local attack vector, low complexity, high privileges required, no user interaction not required.

Exploit ScenarioDerived

Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.5% exploitation probability (EPSS)

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AnalysisAI

Improper input validation in SEV-SNP could allow a malicious hypervisor to read or overwrite guest memory potentially leading to data leakage or data corruption. Rated high severity (CVSS 7.9), 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-20. Improper input validation in SEV-SNP could allow a malicious hypervisor to read or overwrite guest memory potentially leading to data leakage or data corruption. Affected products include: Amd Epyc 7203 Firmware, Amd Epyc 7203P Firmware, Amd Epyc 72F3 Firmware, Amd Epyc 7303 Firmware, Amd Epyc 7303P Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.9 HIGH
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/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
Changed
Confidentiality
High
Integrity
High
Availability
None

DescriptionNVD

Improper input validation in SEV-SNP could allow a malicious hypervisor to read or overwrite guest memory potentially leading to data leakage or data corruption.

Threat Intelligence Overview

EPSS Score
0.5%
Top 61% 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 HIGH
CISA KEV No
Public POC No
EPSS 0.5%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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

40
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +40
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

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_7203_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7203p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7303_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7303p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7343_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_73f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7373x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7413_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_74f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7453_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7473x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7513_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_75f3_firmware:*:*:*:*:*:*:*:*
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CVE-2021-26326 HIGH
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CVE-2023-20566 HIGH
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Improper address validation in ASP with SNP enabled may potentially allow an attacker to compromise guest memory integri

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CVE-2023-20524 HIGH
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An attacker with a compromised ASP could possibly send malformed commands to an ASP on another CPU, resulting in an out

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