What is the CVSS score of CVE-2021-20679?

CVE-2021-20679 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 1.5%.

Docucentre Vii C7773 Firmware CVE-2021-20679

HIGH

2021-03-25 vultures@jpcert.or.jp

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 1.5% exploitation probability (EPSS)

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AnalysisAI

Fuji Xerox multifunction devices and printers (DocuCentre-VII C7773/C6673/C5573/C4473/C3373/C3372/C2273, DocuCentre-VII C7788/C6688/C5588, ApeosPort-VII C7773/C6673/C5573/C4473/C3373/C3372 C2273,. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Fuji Xerox multifunction devices and printers (DocuCentre-VII C7773/C6673/C5573/C4473/C3373/C3372/C2273, DocuCentre-VII C7788/C6688/C5588, ApeosPort-VII C7773/C6673/C5573/C4473/C3373/C3372 C2273, ApeosPort-VII C7788/C6688/C5588, ApeosPort C7070/C6570/C5570/C4570/C3570/C3070/C7070G/C6570G/C5570G/C4570G/C3570G/C3070G, ApeosPort-VII C4421/C3321, ApeosPort C3060/C2560/C2060/C3060G/C2560G/C2060G, ApeosPort-VII CP4421, ApeosPort Print C5570, ApeosPort 5570/4570/5570G/4570G, ApeosPort 3560/3060/2560/3560G/3060G/2560G, ApeosPort-VII 5021/ 4021, ApeosPort-VII P5021, DocuPrint CP 555 d/505 d, DocuPrint P505 d, PrimeLink C9065/C9070, DocuPrint CP475AP, and DocuPrint P475AP) allow an attacker to cause a denial of service (DoS) condition and abnormal end (ABEND) of the affected products via sending a specially crafted command. Affected products include: Fujixerox Docucentre-Vii C7773 Firmware, Fujixerox Docucentre-Vii C6673 Firmware, Fujixerox Docucentre-Vii C5573 Firmware, Fujixerox Docucentre-Vii C4473 Firmware, Fujixerox Docucentre-Vii C3373 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

Fuji Xerox multifunction devices and printers (DocuCentre-VII C7773/C6673/C5573/C4473/C3373/C3372/C2273, DocuCentre-VII C7788/C6688/C5588, ApeosPort-VII C7773/C6673/C5573/C4473/C3373/C3372 C2273, ApeosPort-VII C7788/C6688/C5588, ApeosPort C7070/C6570/C5570/C4570/C3570/C3070/C7070G/C6570G/C5570G/C4570G/C3570G/C3070G, ApeosPort-VII C4421/C3321, ApeosPort C3060/C2560/C2060/C3060G/C2560G/C2060G, ApeosPort-VII CP4421, ApeosPort Print C5570, ApeosPort 5570/4570/5570G/4570G, ApeosPort 3560/3060/2560/3560G/3060G/2560G, ApeosPort-VII 5021/ 4021, ApeosPort-VII P5021, DocuPrint CP 555 d/505 d, DocuPrint P505 d, PrimeLink C9065/C9070, DocuPrint CP475AP, and DocuPrint P475AP) allow an attacker to cause a denial of service (DoS) condition and abnormal end (ABEND) of the affected products via sending a specially crafted command.

Threat Intelligence Overview

EPSS Score

1.5%

Top 28% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 1.5%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +2

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:o:fujixerox:docucentre-vii_c7773_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:docucentre-vii_c6673_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:docucentre-vii_c5573_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:docucentre-vii_c4473_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:docucentre-vii_c3373_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:docucentre-vii_c3372_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:docucentre-vii_c2273_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport_c2570_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport-vii_c4422_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport-vii_c3322_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport_c2360_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport_c2060_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport-vii_cp4422_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport-vii_cp3322_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport_print_c4570_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport_3570_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport_1860_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport-vii_5022_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:apeosport-vii_p4022_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:fujixerox:docucentre-vi_c2264_firmware:-:*:*:*:*:*:*:*

+ 56 more

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References

Advisories & patches

ADVISORY https://www.fujixerox.co.jp/company/news/notice/2021/0319_announce.html ADVISORY https://www.fujixerox.com/eng/company/news/notice/2021/0319_announce.html REF https://jvn.jp/en/jp/JVN37607293/index.html

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GitHub PoC

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