What is CVE-2022-26640?

CVE-2022-26640 is a high-severity vulnerability in TP-Link Tl-Wr840n, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.2/10. Published 2022-03-28.

How severe is CVE-2022-26640?

High severity. CVSS v3 base score is 7.2 out of 10.

Buffer overflow in TP-Link Tl-Wr840n

CVE-2022-26640

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

Vulnerability class: Buffer Overflow

Published 2022-03-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.0th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

TP-Link Tl-Wr840n — versions 6.20
TP-Link Tl-Wr840n Firmware — versions 0.9.1.4.16

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/Quadron-Research-Lab/Hardware-IoT/blob/main/tp-link tl-wr840n_minAdd… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-26640?: CVE-2022-26640 is a high-severity vulnerability in TP-Link Tl-Wr840n, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.2/10. Published 2022-03-28.
How severe is CVE-2022-26640?: High severity. CVSS v3 base score is 7.2 out of 10.