What is CVE-2021-27210?

CVE-2021-27210 is a medium-severity vulnerability in TP-Link Archer C5v, classified under Cleartext Storage of Sensitive Information. CVSS score: 6.5/10. Published 2021-02-13.

How severe is CVE-2021-27210?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in TP-Link Archer C5v

CVE-2021-27210

TP-Link Archer C5v 1.7_181221 devices allows remote attackers to retrieve cleartext credentials via [USER_CFG#0,0,0,0,0,0#0,0,0,0,0,0]0,0 to the /cgi?1&5 URI.

Published 2021-02-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (56.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000

Affected products

TP-Link Archer C5v — versions 1.0
TP-Link Archer C5v Firmware — versions 1.7_181221

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

gokay.org/tp-links-archer-c5v-improper-authorization/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27210?: CVE-2021-27210 is a medium-severity vulnerability in TP-Link Archer C5v, classified under Cleartext Storage of Sensitive Information. CVSS score: 6.5/10. Published 2021-02-13.
How severe is CVE-2021-27210?: Medium severity. CVSS v3 base score is 6.5 out of 10.