How severe is CVE-2021-45382?

CVE-2021-45382 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-45382 being actively exploited?

Yes. CVE-2021-45382 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-04-04, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-45382?

CVE-2021-45382 primarily affects Dlink Dir-820l Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45382?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-45382 have an EU (EUVD) identifier?

Yes. CVE-2021-45382 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-32155. It is also flagged as exploited in the EUVD (since 2022-04-04).

When was CVE-2021-45382 published?

CVE-2021-45382 was published on 2022-02-17 and last updated on 2026-06-17.

CVE-2021-45382

CVE-2021-45382 is a critical-severity vulnerability in Dlink Dir-820l Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-04-04). The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 98% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-04-04)
EU (EUVD) id: EUVD-2021-32155
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-04-04)
Weakness: CWE-78
Affected product: Dlink Dir-820l Firmware
Published: 2022-02-17
Last modified: 2026-06-17

Description

A Remote Command Execution (RCE) vulnerability exists in all series H/W revisions D-link DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L routers via the DDNS function in ncc2 binary file. Note: DIR-810L, DIR-820L, DIR-830L, DIR-826L, DIR-836L, all hardware revisions, have reached their End of Life ("EOL") /End of Service Life ("EOS") Life-Cycle and as such this issue will not be patched.

Frequently asked questions

What is CVE-2021-45382?: A Remote Command Execution (RCE) vulnerability exists in all series H/W revisions D-link DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L routers via the DDNS function in ncc2 binary file. Note: DIR-810L, DIR-820L, DIR-830L, DIR-826L, DIR-836L, all hardware revisions, have reached their End of Life ("EOL") /End of Service Life ("EOS") Life-Cycle and as such this issue will not be patched.
How severe is CVE-2021-45382?: CVE-2021-45382 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-45382 being actively exploited?: Yes. CVE-2021-45382 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-04-04, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2021-45382?: CVE-2021-45382 primarily affects Dlink Dir-820l Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45382?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2021-45382 have an EU (EUVD) identifier?: Yes. CVE-2021-45382 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-32155. It is also flagged as exploited in the EUVD (since 2022-04-04).
When was CVE-2021-45382 published?: CVE-2021-45382 was published on 2022-02-17 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:o:dlink:dir-820l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-820lw_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-826l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-830l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-836l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-810l_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-820l Firmware

CVE-2024-48150 — Critical (CVSS 9.8): D-Link DIR-820L 1.05B03 has a stack overflow vulnerability in the sub_451208 function.
CVE-2023-44809 — Critical (CVSS 9.8): D-Link device DIR-820L 1.05B03 is vulnerable to Insecure Permissions.
CVE-2023-44808 — Critical (CVSS 9.8): D-Link DIR-820L 1.05B03 has a stack overflow vulnerability in the sub_4507CC function.
CVE-2023-44807 — Critical (CVSS 9.8): D-Link DIR-820L 1.05B03 has a stack overflow vulnerability in the cancelPing function.
CVE-2023-25280 — Critical (CVSS 9.8): OS Command injection vulnerability in D-Link DIR820LA1_FW105B03 allows attackers to escalate privileges to root via a…
CVE-2023-25279 — Critical (CVSS 9.8): OS Command injection vulnerability in D-Link DIR820LA1_FW105B03 allows attackers to escalate privileges to root via a…

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