Is CVE-2021-20676 in the CISA KEV catalog?

No. CVE-2021-20676 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20676?

CVE-2021-20676 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-20676?

CVE-2021-20676 has an EPSS score of 0.77% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20676?

Upgrade dl8-a firmware to 3.0.81 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20676

MEDIUM

4.3

CVSS v3

NVD

Description

M-System DL8 series (type A (DL8-A) versions prior to Ver3.0, type B (DL8-B) versions prior to Ver3.0, type C (DL8-C) versions prior to Ver3.0, type D (DL8-D) versions prior to Ver3.0, and type E (DL8-E) versions prior to Ver3.0) allows remote authenticated attackers to bypass access restriction and conduct prohibited operations via unspecified vectors.

CWE-863Incorrect Authorization

How to fix

Remediation Available

dl8-a firmwareNVD

Affected:< 3.0.81Fixed in:3.0.81CVE-2021-20676derived from NVD

dl8-b firmwareNVD

Affected:< 3.0.77Fixed in:3.0.77CVE-2021-20676derived from NVD

dl8-c firmwareNVD

Affected:< 3.0.99Fixed in:3.0.99CVE-2021-20676derived from NVD

dl8-d firmwareNVD

Affected:< 3.0.91Fixed in:3.0.91CVE-2021-20676derived from NVD

dl8-e firmwareNVD

Affected:< 3.0.12Fixed in:3.0.12CVE-2021-20676derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

0.77%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Vendor Advisory1

m-system.co.jp

Third-Party Advisory1

jvn.jp

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.