How severe is CVE-2021-20696?

CVE-2021-20696 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20696 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20696?

CVE-2021-20696 affects Dlink Dap-1880ac Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20696?

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-2021-20696 published?

CVE-2021-20696 was published on 2021-04-26 and last updated on 2026-06-17.

CVE-2021-20696

CVE-2021-20696 is a high-severity vulnerability in Dlink Dap-1880ac Firmware with a CVSS 3.x base score of 8.8. 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-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Dlink Dap-1880ac Firmware
Published: 2021-04-26
Last modified: 2026-06-17

Description

DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to execute arbitrary OS commands by sending a specially crafted request to a specific CGI program.

Frequently asked questions

What is CVE-2021-20696?: DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to execute arbitrary OS commands by sending a specially crafted request to a specific CGI program.
How severe is CVE-2021-20696?: CVE-2021-20696 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20696 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20696?: CVE-2021-20696 affects Dlink Dap-1880ac Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20696?: 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-2021-20696 published?: CVE-2021-20696 was published on 2021-04-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dap-1880ac_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dap-1880ac Firmware

CVE-2021-20697 — Critical (CVSS 9.8): Missing authentication for critical function in DAP-1880AC firmware version 1.21 and earlier allows a remote attacker…
CVE-2021-20695 — High (CVSS 8.8): Improper following of a certificate's chain of trust vulnerability in DAP-1880AC firmware version 1.21 and earlier…
CVE-2021-20694 — High (CVSS 8.8): Improper access control vulnerability in DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated…

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