What is CVE-2021-28858?

CVE-2021-28858 is a medium-severity vulnerability in TP-Link Tl-Wpa4220, classified under Cleartext Storage of Sensitive Information. CVSS score: 5.5/10. Published 2021-06-15.

How severe is CVE-2021-28858?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in TP-Link Tl-Wpa4220

CVE-2021-28858

TP-Link's TL-WPA4220 4.0.2 Build 20180308 Rel.37064 does not use SSL by default. Attacker on the local network can monitor traffic and capture the cookie and other sensitive information.

Published 2021-06-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (15.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

TP-Link Tl-Wpa4220 — versions 4.0
TP-Link Tl-Wpa4220 Firmware — versions 4.0.2

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

yunus-shn.medium.com/tp-links-tl-wpa4220-v4-0-cleartext-transmission-of-sensiti… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-28858?: CVE-2021-28858 is a medium-severity vulnerability in TP-Link Tl-Wpa4220, classified under Cleartext Storage of Sensitive Information. CVSS score: 5.5/10. Published 2021-06-15.
How severe is CVE-2021-28858?: Medium severity. CVSS v3 base score is 5.5 out of 10.