CVE-2021-20872

CVE-2021-20872 is a medium-severity vulnerability in Konicaminolta Bizhub C759 Firmware with a CVSS 3.x base score of 6.8. 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 6.8)
• CVSS v2: 4.6
• EPSS exploit prediction: 0% (22nd percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Konicaminolta Bizhub C759 Firmware
• Published: 2022-01-04
• Last modified: 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.

Frequently asked questions

What is 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.

How severe is CVE-2021-20872?

CVE-2021-20872 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20872 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20872?

CVE-2021-20872 primarily affects Konicaminolta Bizhub C759 Firmware. In total, 52 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20872?

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

When was CVE-2021-20872 published?

CVE-2021-20872 was published on 2022-01-04 and last updated on 2026-06-17.

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

Affected products (52)

• cpe:2.3:o:konicaminolta:bizhub_c759_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c659_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c658_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c558_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c458_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_958_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_808_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_758_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_658e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_558e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_458e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c287_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c227_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_287_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_227_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_368e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_308e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c368_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c308_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c258_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_558_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_458_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_368_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_308_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c754e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c654e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_754e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_654e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c554e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c454e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c364e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c284e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c224e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_554e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_454e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_364e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_284e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_224e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c754_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:konicaminolta:bizhub_c654_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Konicaminolta Bizhub C759 Firmware

• CVE-2022-29588 — High (CVSS 7.5): Konica Minolta bizhub MFP devices before 2022-04-14 use cleartext password storage for the…
• CVE-2022-29586 — High (CVSS 7.4): Konica Minolta bizhub MFP devices before 2022-04-14 allow a Sandbox Escape. An attacker must attach a keyboard to a USB…
• CVE-2021-20871 — Medium (CVSS 6.5): Exposure of sensitive information to an unauthorized actor vulnerability in KONICA MINOLTA bizhub series (bizhub C750i…
• CVE-2021-20869 — Medium (CVSS 6.5): Exposure of sensitive information to an unauthorized actor vulnerability in KONICA MINOLTA bizhub series (bizhub C750i…
• CVE-2021-20870 — Medium (CVSS 4.6): Improper handling of exceptional conditions vulnerability in KONICA MINOLTA bizhub series (bizhub C750i G00-35 and…
• CVE-2021-20868 — Medium (CVSS 4.5): Incorrect authorization vulnerability in KONICA MINOLTA bizhub series (bizhub C750i G00-35 and earlier, bizhub…

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