What is the CVSS score of CVE-2020-8336?

CVE-2020-8336 has a CVSS 3.1 base score of 6.8 (Medium). CVSS vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Thinkpad E490S Firmware CVE-2020-8336

MEDIUM

2020-06-09 psirt@lenovo.com

6.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Impact	CVSS score of 6.8 (MEDIUM). Attack characteristics: physical attack vector, low complexity, no 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 0.3% exploitation probability (EPSS)

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AnalysisAI

Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash. Rated medium severity (CVSS 6.8), this vulnerability is no authentication required, 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

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Technical ContextAI · show details

Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash. Affected products include: Lenovo Thinkpad E14 Firmware, Lenovo Thinkpad E15 Firmware, Lenovo Thinkpad R14 Firmware, Lenovo Thinkpad S3 Gen 2 Firmware, Lenovo Thinkpad E490S Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.8 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash.

Threat Intelligence Overview

EPSS Score

0.3%

Top 80% 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 0.3%

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: +34

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

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:lenovo:thinkpad_e14_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_e15_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_r14_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_s3_gen_2_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_e490s_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_s3_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_e490_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_e590_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_r490_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_r590_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_l13_1st_gen_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_l1415_gen_1_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_s2_yoga_4th_gen_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_l490_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_l590_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_p1_\(20mx\)_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_p1_\(20qx\)_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_p43s_\(20rx\)_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:lenovo:thinkpad_p52_\(20mx\)_firmware:*:*:*:*:*:*:*:*

+ 18 more

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References

Advisories & patches

ADVISORY https://support.lenovo.com/us/en/product_security/LEN-30042

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GitHub PoC

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