A potential vulnerability in the SMI callback function used in the legacy BIOS mode USB drivers in some legacy Lenovo and IBM System x serv…

published 2020-10-14 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-29199

cvss: 6.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

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.

Patch / fix

fixed in 18

lenovo bladecenter_hs23_firmware tke170b
lenovo bladecenter_hs23e_firmware ahe172b
lenovo compute_node-x440_firmware cge128a
lenovo flex_system_x220_firmware kse170b
lenovo flex_system_x240_firmware b2e172b
lenovo flex_system_x440_firmware cne172b
lenovo nextscale_nx360_m4_firmware fhe132b
lenovo system_x3300_m4_firmware yae166b
lenovo system_x3500_m4_firmware y5e170b
lenovo system_x3530_m4_firmware bee174b
lenovo system_x3550_m4_firmware d7e174b
lenovo system_x3630_m4_firmware bee174b
lenovo system_x3650_m4_firmware vve172b
lenovo system_x3650_m4_bd_firmware vve172b
lenovo system_x3650_m4_hd_firmware vve172b
lenovo system_x3750_m4_firmware a5e130a, koe170b
lenovo idataplex_dx360_m4_firmware tde168b
lenovo idataplex_dx360_m4_water_cooled_firmware tde168b

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.4	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	6.4	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.9	AV:L/AC:M/Au:N/C:C/I:C/A:C

Affected products

Lenovo System x
IBM System x

Classification

Weakness

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

References

support.lenovo.com /us/en/product_security/LEN-38625
vendor-advisory

Sources

CVE List CVE-2020-8332
NVD CVE-2020-8332

Fencer Vulns 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.

Summary