What is the CVSS score of CVE-2020-8332?

CVE-2020-8332 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

System X3750 M4 Firmware CVE-2020-8332

MEDIUM

Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)

2020-10-14 psirt@lenovo.com

RCE IBM Lenovo System X3750 M4 Firmware Bladecenter Hs23 Firmware Bladecenter Hs23E Firmware Idataplex Dx360 M4 Firmware Idataplex Dx360 M4 Water Cooled Firmware Nextscale Nx360 M4 Firmware System X3300 M4 Firmware System X3500 M4 Firmware System X3530 M4 Firmware System X3550 M4 Firmware System X3630 M4 Firmware System X3650 M4 Firmware System X3650 M4 Bd Firmware System X3650 M4 Hd Firmware Compute Node X440 Firmware Flex System X220 Firmware Flex System X240 Firmware Flex System X440 Firmware

6.4

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-367 ASVS 5.0 V15 - Secure Coding and Architecture TOCTOU prevention
Impact	CVSS score of 6.4 (MEDIUM). Attack characteristics: local attack vector, high 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

A potential vulnerability in the SMI callback function used in the legacy BIOS mode USB drivers in some legacy Lenovo and IBM System x servers may allow arbitrary code execution. Rated medium severity (CVSS 6.4). 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-367. A potential vulnerability in the SMI callback function used in the legacy BIOS mode USB drivers in some legacy Lenovo and IBM System x servers may allow arbitrary code execution. Servers operating in UEFI mode are not affected. Affected products include: Lenovo Bladecenter Hs23 Firmware, Lenovo Bladecenter Hs23E Firmware, Lenovo Compute Node-X440 Firmware, Lenovo Flex System X220 Firmware, Lenovo Flex System X240 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.4 MEDIUM

AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

A potential vulnerability in the SMI callback function used in the legacy BIOS mode USB drivers in some legacy Lenovo and IBM System x servers may allow arbitrary code execution. Servers operating in UEFI mode are not affected.

Threat Intelligence Overview

EPSS Score

0.2%

Top 86% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:o:lenovo:bladecenter_hs23_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:bladecenter_hs23e_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:compute_node-x440_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:flex_system_x220_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:flex_system_x240_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:flex_system_x440_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:nextscale_nx360_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3300_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3500_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3530_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3550_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3630_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3650_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3650_m4_bd_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3650_m4_hd_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:system_x3750_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:idataplex_dx360_m4_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:idataplex_dx360_m4_water_cooled_firmware:*:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://support.lenovo.com/us/en/product_security/LEN-38625

Search Externally

GitHub PoC

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