How severe is CVE-2021-20676?

CVE-2021-20676 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-20676 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20676?

CVE-2021-20676 primarily affects M-system Dl8-a Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20676?

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

When was CVE-2021-20676 published?

CVE-2021-20676 was published on 2021-03-18 and last updated on 2026-06-17.

CVE-2021-20676

CVE-2021-20676 is a medium-severity vulnerability in M-system Dl8-a Firmware with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: M-system Dl8-a Firmware
Published: 2021-03-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-20676?: 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.
How severe is CVE-2021-20676?: CVE-2021-20676 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-20676 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20676?: CVE-2021-20676 primarily affects M-system Dl8-a Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20676?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20676 published?: CVE-2021-20676 was published on 2021-03-18 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:o:m-system:dl8-a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:m-system:dl8-b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:m-system:dl8-c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:m-system:dl8-d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:m-system:dl8-e_firmware:*:*:*:*:*:*:*:*

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