What’s Vulnerable › Vulnerabilities

CVE-2021-20872

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-04 · updated 2026-06-17

Description

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.

Affected products

• Konicaminolta Bizhub 224E Firmware: before gdr-m1 — fixed in gdr-m1
• Konicaminolta Bizhub 227 Firmware: before gca-y0 — fixed in gca-y0
• Konicaminolta Bizhub 284E Firmware: before gdr-m1 — fixed in gdr-m1
• Konicaminolta Bizhub 287 Firmware: before gca-y0 — fixed in gca-y0
• Konicaminolta Bizhub 308 Firmware: before gca-x4 — fixed in gca-x4
• Konicaminolta Bizhub 308E Firmware: before gca-x8 — fixed in gca-x8
• Konicaminolta Bizhub 364E Firmware: before gdr-m1 — fixed in gdr-m1
• Konicaminolta Bizhub 368 Firmware: before gca-x4 — fixed in gca-x4
• Konicaminolta Bizhub 368E Firmware: before gca-x8 — fixed in gca-x8
• Konicaminolta Bizhub 4052 Firmware: before gca-x4 — fixed in gca-x4
• Konicaminolta Bizhub 454E Firmware: before gdr-m1 — fixed in gdr-m1
• Konicaminolta Bizhub 458 Firmware: before gca-x4 — fixed in gca-x4
• Konicaminolta Bizhub 458E Firmware: before gca-y1 — fixed in gca-y1
• Konicaminolta Bizhub 4752 Firmware: before gca-x4 — fixed in gca-x4
• Konicaminolta Bizhub 554E Firmware: before gdr-m1 — fixed in gdr-m1
• Konicaminolta Bizhub 558 Firmware: before gca-x4 — fixed in gca-x4
• Konicaminolta Bizhub 558E Firmware: before gca-y1 — fixed in gca-y1
• Konicaminolta Bizhub 654 Firmware: before gr4-m0 — fixed in gr4-m0
• Konicaminolta Bizhub 654E Firmware: before gdr-m0 — fixed in gdr-m0
• Konicaminolta Bizhub 658E Firmware: before gca-y1 — fixed in gca-y1
• Konicaminolta Bizhub 754 Firmware: before gr4-m0 — fixed in gr4-m0
• Konicaminolta Bizhub 754E Firmware: before gdr-m0 — fixed in gdr-m0
• Konicaminolta Bizhub 758 Firmware: before gca-y1 — fixed in gca-y1
• Konicaminolta Bizhub 808 Firmware: before gca-y1 — fixed in gca-y1
• Konicaminolta Bizhub 958 Firmware: before gca-y1 — fixed in gca-y1
• Konicaminolta Bizhub C224 Firmware: before gr4-m0 — fixed in gr4-m0
• Konicaminolta Bizhub C224E Firmware: before gdr-m1 — fixed in gdr-m1
• Konicaminolta Bizhub C227 Firmware: before gca-y0 — fixed in gca-y0
• Konicaminolta Bizhub C258 Firmware: before gca-x4 — fixed in gca-x4
• Konicaminolta Bizhub C284 Firmware: before gr4-m0 — fixed in gr4-m0

How to fix

Upgrade to a fixed version: Konicaminolta Bizhub 224E Firmware gdr-m1; Konicaminolta Bizhub 227 Firmware gca-y0; Konicaminolta Bizhub 284E Firmware gdr-m1; Konicaminolta Bizhub 287 Firmware gca-y0; Konicaminolta Bizhub 308 Firmware gca-x4; Konicaminolta Bizhub 308E Firmware gca-x8; Konicaminolta Bizhub 364E Firmware gdr-m1; Konicaminolta Bizhub 368 Firmware gca-x4; Konicaminolta Bizhub 368E Firmware gca-x8; Konicaminolta Bizhub 4052 Firmware gca-x4; Konicaminolta Bizhub 454E Firmware gdr-m1; Konicaminolta Bizhub 458 Firmware gca-x4. Check the vendor advisory for mitigations.

References

• https://jvn.jp/en/vu/JVNVU95192472/index.html
• https://jvn.jp/vu/JVNVU95192472/index.html
• https://www.konicaminolta.com/global/newsroom/topics/2021/1224-01-01.html
• https://www.konicaminolta.jp/business/support/important/211224_01_01.html
• https://jvn.jp/en/vu/JVNVU95192472/index.html
• https://jvn.jp/vu/JVNVU95192472/index.html
• https://www.konicaminolta.com/global/newsroom/topics/2021/1224-01-01.html
• https://www.konicaminolta.jp/business/support/important/211224_01_01.html

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