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NVD / CVE Program· CNA lenovo

CVE-2020-8336: Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash.

Noroxi assessment

Priority: Monitor (action score 27/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.29% (FIRST EPSS).
  • Physical access to the device is required. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

MediumCVSS 6.8 · v3.1—No exploit No fix recorded
Published
Jun 9, 2020
Updated
Jun 16, 2026
EPSS
0.2% · 22th percentile
CWE
—

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
6.8
CNA · lenovo
6.4
0.4 point gap

CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-8336

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
lenovothinkpad e14 firmware
lenovothinkpad e14
lenovothinkpad e15 firmware
lenovothinkpad e15
lenovothinkpad r14 firmware
lenovothinkpad r14
lenovothinkpad s3 gen 2 firmware
lenovothinkpad s3 gen 2
lenovothinkpad e490s firmware
lenovothinkpad e490s
lenovothinkpad s3 firmware
lenovothinkpad s3

and 64 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • lenovo thinkpad e14 firmwarebefore 2020-07-10
  • lenovo thinkpad e15 firmwarebefore 2020-07-10
  • lenovo thinkpad e490 firmwarebefore 2020-07-10
  • lenovo thinkpad e490s firmwarebefore 2020-07-10
  • lenovo thinkpad e590 firmwarebefore 2020-07-10
  • lenovo thinkpad l13 1st gen firmwarebefore 2020-07-10
  • lenovo thinkpad l1415 gen 1 firmwarebefore 2020-07-10
  • lenovo thinkpad l390 yoga firmwarebefore 2020-07-10
  • lenovo thinkpad l490 firmwarebefore 2020-07-10
  • lenovo thinkpad l590 firmwarebefore 2020-07-10
  • lenovo thinkpad p1 (20mx) firmwarebefore n2eet47w
  • lenovo thinkpad p1 (20qx) firmwarebefore n2oet44w
  • lenovo thinkpad p43s (20rx) firmwarebefore n2iet88w
  • lenovo thinkpad p52 (20mx) firmwarebefore n2cet51w-1.34
  • lenovo thinkpad p53 (20qx) firmwarebefore n2net37w
  • lenovo thinkpad p53s (20nx) firmwarebefore n2iet88w
  • lenovo thinkpad p72 (20mx) firmwarebefore n2cet51w
  • lenovo thinkpad p73 (20qx) firmwarebefore n2net37w
  • lenovo thinkpad r14 firmwarebefore 2020-07-10
  • lenovo thinkpad r490 firmwarebefore 2020-07-10

Versions reported by the vendor

Affected version ranges reported by the assigning authority (lenovo). Independent of NVD's CPE analysis and usually ahead of it.

  • Lenovo BIOS

    • variousaffected

Same product

lenovo: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-48189An SMM driver input validation vulnerability in the BIOS of some ThinkPad models could allow an attacker with local access and elevated priv
    26Monitor
  • CVE-2023-2290A potential vulnerability in the LenovoFlashDeviceInterface SMI handler may allow an attacker with local access and elevated privileges to e
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Physical access to the device is required.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Physical
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records