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Fencer Intel
medium 6.4

CVE-2020-8336 json

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

published 6y ago modified 4mo ago also EUVD-2020-29203

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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

Patch / fix

  • lenovo thinkpad_e14_firmware 2020-07-10
  • lenovo thinkpad_e15_firmware 2020-07-10
  • lenovo thinkpad_r14_firmware 2020-07-10
  • lenovo thinkpad_s3_gen_2_firmware 2020-07-10
  • lenovo thinkpad_e490s_firmware 2020-07-10
  • lenovo thinkpad_s3_firmware 2020-07-10
  • lenovo thinkpad_e490_firmware 2020-07-10
  • lenovo thinkpad_e590_firmware 2020-07-10
  • lenovo thinkpad_r490_firmware 2020-07-10
  • lenovo thinkpad_r590_firmware 2020-07-10
  • lenovo thinkpad_l13_1st_gen_firmware 2020-07-10
  • lenovo thinkpad_l1415_gen_1_firmware 2020-07-10
  • lenovo thinkpad_l390_yoga_firmware 2020-07-10
  • lenovo thinkpad_s2_yoga_4th_gen_firmware 2020-07-10
  • lenovo thinkpad_l490_firmware 2020-07-10
  • lenovo thinkpad_l590_firmware 2020-07-10
  • lenovo thinkpad_p1_(20mx)_firmware n2eet47w
  • lenovo thinkpad_p1_(20qx)_firmware n2oet44w
  • lenovo thinkpad_p43s_(20rx)_firmware n2iet88w
  • lenovo thinkpad_p52_(20mx)_firmware n2cet51w-1.34

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Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.4 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.8 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Lenovo BIOS

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.