What is CVE-2021-44632?

CVE-2021-44632 is a critical-severity vulnerability in TP-Link Tl-Wr886n, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2022-03-10.

How severe is CVE-2021-44632?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in TP-Link Tl-Wr886n

CVE-2021-44632

A Buffer Overflow vulnerability exists in TP-LINK WR-886N 20190826 2.3.8 in the /cloud_config/router_post/upgrade_info feature, which allows malicious users to execute arbitrary code on the system via a crafted post request.

Vulnerability class: Buffer Overflow

Published 2022-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.026 (84.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

TP-Link Tl-Wr886n
TP-Link Tl-Wr886n Firmware — versions 20190826_2.3.8

Weakness classification (CWE)

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

References

github.com/Yu3H0/IoT_CVE/tree/main/886N/upgradeInfoRegister (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-44632?: CVE-2021-44632 is a critical-severity vulnerability in TP-Link Tl-Wr886n, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2022-03-10.
How severe is CVE-2021-44632?: Critical severity. CVSS v3 base score is 9.8 out of 10.