CVE-2021-20694

Name: CVE-2021-20694
Creator: NVD / NIST
Published: 2021-04-26T01:15:07.83+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.70%

Last modified Jun 17, 2026

CVE-2021-20694 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Improper access control vulnerability in DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to bypass access restriction and to start a telnet service via unspecified vectors.. EPSS estimates a 1.70% chance of exploitation in the next 30 days.

Description

Improper access control vulnerability in DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to bypass access restriction and to start a telnet service via unspecified vectors.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.70%

74.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Dlink	Dap-1880ac Firmware	<= 1.21

References

https://jvn.jp/en/vu/JVNVU92898656/index.htmlThird Party Advisory
https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.htmlVendor Advisory
https://jvn.jp/en/vu/JVNVU92898656/index.htmlThird Party Advisory
https://www.dlink-jp.com/support/release/jvnvu92898656_dap-1880ac.htmlVendor Advisory

Timeline

Published: Apr 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20694?

How severe is CVE-2021-20694?

CVE-2021-20694 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20694?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20694?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST