How severe is CVE-2021-28143?

CVE-2021-28143 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28143 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 32% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28143?

CVE-2021-28143 primarily affects Dlink Dir-841 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-28143?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-28143 published?

CVE-2021-28143 was published on 2021-03-11 and last updated on 2026-06-17.

CVE-2021-28143

CVE-2021-28143 is a high-severity vulnerability in Dlink Dir-841 Firmware with a CVSS 3.x base score of 8.0. Its EPSS exploit-prediction score of 32% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.0)
CVSS v2: 7.7
EPSS exploit prediction: 32% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Dlink Dir-841 Firmware
Published: 2021-03-11
Last modified: 2026-06-17

Description

/jsonrpc on D-Link DIR-841 3.03 and 3.04 devices allows authenticated command injection via ping, ping6, or traceroute (under System Tools).

Frequently asked questions

What is CVE-2021-28143?: /jsonrpc on D-Link DIR-841 3.03 and 3.04 devices allows authenticated command injection via ping, ping6, or traceroute (under System Tools).
How severe is CVE-2021-28143?: CVE-2021-28143 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28143 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 32% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28143?: CVE-2021-28143 primarily affects Dlink Dir-841 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-28143?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28143 published?: CVE-2021-28143 was published on 2021-03-11 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:dlink:dir-841_firmware:3.03:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-841_firmware:3.04:*:*:*:*:*:*:*

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