CVE-2021-20872

Protection mechanism failure vulnerability in KONICA MINOLTA bizhub series (bizhub C750i G00-35 and earlier, bizhub C650i/C550i/C450i G00-B6 and earlier, bizhub C360i/C300i/C250i G00-B6 and earlier, bizhub 750i/650i/550i/450i G00-37 and earlier, bizhub 360i/300i G00-33 and earlier, bizhub C287i/C257i/C227i G00-19 and earlier, bizhub 306i/266i/246i/226i G00-B6 and earlier, bizhub C759/C659 GC7-X8 and earlier, bizhub C658/C558/C458 GC7-X8 and earlier, bizhub 958/808/758 GC7-X8 and earlier, bizhub 658e/558e/458e GC7-X8 and earlier, bizhub C287/C227 GC7-X8 and earlier, bizhub 287/227 GC7-X8 and earlier, bizhub 368e/308e GC7-X8 and earlier, bizhub C368/C308/C258 GC9-X4 and earlier, bizhub 558/458/368/308 GC9-X4 and earlier, bizhub C754e/C654e GDQ-M0 and earlier, bizhub 754e/654e GDQ-M0 and earlier, bizhub C554e/C454e GDQ-M1 and earlier, bizhub C364e/C284e/C224e GDQ-M1 and earlier, bizhub 554e/454e/364e/284e/224e GDQ-M1 and earlier, bizhub C754/C654 C554/C454 GR1-M0 and earlier, bizhub C364/C284/C224 GR1-M0 and earlier, bizhub 754/654 GR1-M0 and earlier, bizhub C3851FS/C3851/C3351 GC9-X4 and earlier, bizhub 4752/4052 GC9-X4 and earlier) allows a physical attacker to bypass the firmware integrity verification and to install malicious firmware.

Published: 2022-01-03 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-20872 is rated Low Risk (34.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.30%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-20872

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.14% 0.30% +0.16%
2 2025-03-30 0.27% 0.14% -0.13%
3 2025-03-29 — 0.27% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-20872

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 3.1 MEDIUM
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:P)
Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.9 5.9 [email protected]
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2021-20872

Affected software / configurations for CVE-2021-20872

Vendor Product Version Raw CPE
konicaminolta bizhub_c759_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_c759_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c659_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_c659_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c658_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_c658_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c558_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_c558_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c458_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_c458_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_958_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_958_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_808_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_808_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_758_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_758_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_658e_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_658e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_558e_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_558e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_458e_firmware < gca-y1 cpe:2.3:o:konicaminolta:bizhub_458e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c287_firmware < gca-y0 cpe:2.3:o:konicaminolta:bizhub_c287_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c227_firmware < gca-y0 cpe:2.3:o:konicaminolta:bizhub_c227_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_287_firmware < gca-y0 cpe:2.3:o:konicaminolta:bizhub_287_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_227_firmware < gca-y0 cpe:2.3:o:konicaminolta:bizhub_227_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_368e_firmware < gca-x8 cpe:2.3:o:konicaminolta:bizhub_368e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_308e_firmware < gca-x8 cpe:2.3:o:konicaminolta:bizhub_308e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c368_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_c368_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c308_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_c308_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c258_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_c258_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_558_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_558_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_458_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_458_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_368_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_368_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_308_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_308_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c754e_firmware < gdr-m0 cpe:2.3:o:konicaminolta:bizhub_c754e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c654e_firmware < gdr-m0 cpe:2.3:o:konicaminolta:bizhub_c654e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_754e_firmware < gdr-m0 cpe:2.3:o:konicaminolta:bizhub_754e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_654e_firmware < gdr-m0 cpe:2.3:o:konicaminolta:bizhub_654e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c554e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_c554e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c454e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_c454e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c364e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_c364e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c284e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_c284e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c224e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_c224e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_554e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_554e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_454e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_454e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_364e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_364e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_284e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_284e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_224e_firmware < gdr-m1 cpe:2.3:o:konicaminolta:bizhub_224e_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c754_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_c754_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c654_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_c654_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c554_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_c554_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c454_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_c454_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c364_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_c364_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c284_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_c284_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c224_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_c224_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_754_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_754_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_654_firmware < gr4-m0 cpe:2.3:o:konicaminolta:bizhub_654_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c3851fs_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_c3851fs_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c3851_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_c3851_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_c3351_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_c3351_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_4752_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_4752_firmware:*:*:*:*:*:*:*:*
konicaminolta bizhub_4052_firmware < gca-x4 cpe:2.3:o:konicaminolta:bizhub_4052_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-20872

cvelogic Threat Intelligence