CVE-2020-8336

CVE-2020-8336 is a medium-severity vulnerability in Lenovo Thinkpad E14 Firmware with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: Medium (CVSS 3.x base score 6.4)
• CVSS v2: 4.6
• EPSS exploit prediction: 0% (20th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Lenovo Thinkpad E14 Firmware
• Published: 2020-06-09
• Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2020-8336?

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

How severe is CVE-2020-8336?

CVE-2020-8336 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-8336 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8336?

CVE-2020-8336 primarily affects Lenovo Thinkpad E14 Firmware. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-8336?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-8336 published?

CVE-2020-8336 was published on 2020-06-09 and last updated on 2026-06-17.

References

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

Affected products (38)

• 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:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_p53_\(20qx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_p53s_\(20nx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_p72_\(20mx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_p73_\(20qx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_t490_\(20nx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_t490_\(20qx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_t490_\(20rx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_t490s_\(20nx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_t590_\(20nx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x1_carbon_\(20qx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x1_carbon_\(20rx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x1_extreme_\(20mx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x1_extreme_\(20qx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x1_yoga_\(20qx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x1_yoga_\(20sx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x390_\(20qx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x390_\(20sx\)_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Lenovo Thinkpad E14 Firmware

• CVE-2022-48189 — Medium (CVSS 6.7): An SMM driver input validation vulnerability in the BIOS of some ThinkPad models could allow an attacker with local…
• CVE-2021-3599 — Medium (CVSS 6.7): A potential vulnerability in the SMI callback function used to access flash device in some ThinkPad models may allow an…
• CVE-2023-2290 — Medium (CVSS 6.4): A potential vulnerability in the LenovoFlashDeviceInterface SMI handler may allow an attacker with local access and…
• CVE-2020-8323 — Medium (CVSS 6.4): A potential vulnerability in the SMI callback function used in the Legacy SD driver in some Lenovo ThinkPad,…
• CVE-2020-8320 — Medium (CVSS 6.4): An internal shell was included in BIOS image in some ThinkPad models that could allow escalation of privilege.
• CVE-2022-40134 — Medium (CVSS 4.4): An information leak vulnerability in the SMI Set BIOS Password SMI Handler in some Lenovo models may allow an attacker…

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