What is CVE-2023-43135?

CVE-2023-43135 is a critical-severity vulnerability in TP-Link Tl-Er5120g, classified under Missing Authorization. CVSS score: 9.8/10. Published 2023-09-20.

How severe is CVE-2023-43135?

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

Auth bypass in TP-Link Tl-Er5120g

CVE-2023-43135

There is an unauthorized access vulnerability in TP-LINK ER5120G 4.0 2.0.0 Build 210817 Rel.80868n, which allows attackers to obtain sensitive information of the device without authentication, obtain user tokens, and ultimately log in to the device backend management.

Vulnerability class: Broken Access Control

Published 2023-09-20 · 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: 0.009 (58.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.8% 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: 0.009 · change: +0.002

Affected products

TP-Link Tl-Er5120g — versions 4.0
TP-Link Tl-Er5120g Firmware — versions 2.0.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

github.com/7R4C4R/CVE/blob/main/TPLINK-TL-ER5120G/unauthorized access/Unauthori… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-43135?: CVE-2023-43135 is a critical-severity vulnerability in TP-Link Tl-Er5120g, classified under Missing Authorization. CVSS score: 9.8/10. Published 2023-09-20.
How severe is CVE-2023-43135?: Critical severity. CVSS v3 base score is 9.8 out of 10.