What is CVE-2024-31815?

CVE-2024-31815 is a critical-severity vulnerability in Totolink Ex200, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.1/10. Published 2024-04-08.

How severe is CVE-2024-31815?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2024-31815 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Totolink Ex200

CVE-2024-31815

In TOTOLINK EX200 V4.0.3c.7314_B20191204, an attacker can obtain the configuration file without authorization through /cgi-bin/ExportSettings.sh

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2024-04-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Totolink Ex200
Totolink Ex200 Firmware — versions 4.0.3c.7646_b20201211

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

Public proof-of-concept exploits

References

github.com/4hsien/CVE-vulns/blob/main/TOTOLINK/EX200/Leak_ExportSettings/Leak.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2024-31815?: CVE-2024-31815 is a critical-severity vulnerability in Totolink Ex200, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.1/10. Published 2024-04-08.
How severe is CVE-2024-31815?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2024-31815 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.