What is CVE-2021-46122?

CVE-2021-46122 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 2022-04-18.

How severe is CVE-2021-46122?

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

Buffer overflow in TP-Link Tl-Wr840n

CVE-2021-46122

Tp-Link TL-WR840N (EU) v6.20 Firmware (0.9.1 4.17 v0001.0 Build 201124 Rel.64328n) is vulnerable to Buffer Overflow via the Password reset feature.

Vulnerability class: Buffer Overflow

Published 2022-04-18 · 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: 0.016 (74.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

TP-Link Tl-Wr840n — versions 6.20
TP-Link Tl-Wr840n Firmware — versions 0.9.1_4.17_v0001.0

Weakness classification (CWE)

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

References

k4m1ll0.com/cve-tplink-tlwr840n-euV620-password-reset.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-46122?: CVE-2021-46122 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 2022-04-18.
How severe is CVE-2021-46122?: High severity. CVSS v3 base score is 7.2 out of 10.