CVE-2022-26639

Name: CVE-2022-26639
Creator: NVD / NIST
Published: 2022-03-28T23:15:07.81+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.23%

Last modified Jun 17, 2026

CVE-2022-26639 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. TP-LINK TL-WR840N(ES)_V6.20 was discovered to contain a buffer overflow via the DNSServers parameter.. EPSS estimates a 1.23% chance of exploitation in the next 30 days.

Description

TP-LINK TL-WR840N(ES)_V6.20 was discovered to contain a buffer overflow via the DNSServers parameter.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

1.23%

65.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Tp-Link	Tl-Wr840n Firmware	0.9.1.4.16

References

https://github.com/Quadron-Research-Lab/Hardware-IoT/blob/main/tp-link%20tl-wr840n_DNSServers%3D.pdfExploit, Third Party Advisory
https://github.com/Quadron-Research-Lab/Hardware-IoT/blob/main/tp-link%20tl-wr840n_DNSServers%3D.pdfExploit, Third Party Advisory

Timeline

Published: Mar 28, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-26639?

TP-LINK TL-WR840N(ES)_V6.20 was discovered to contain a buffer overflow via the DNSServers parameter.

How severe is CVE-2022-26639?

CVE-2022-26639 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.

How do I fix CVE-2022-26639?

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-2022-26639?

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

Scan your code now

Source: NVD / NIST