What is CVE-2020-18331?

CVE-2020-18331 is a critical-severity vulnerability in Chinamobileltd Gpn2.4p21-C-Cn, classified under Path Traversal. CVSS score: 9.1/10. Published 2023-01-26.

How severe is CVE-2020-18331?

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

Path Traversal in Chinamobileltd Gpn2.4p21-C-Cn

CVE-2020-18331

Directory traversal vulnerability in ChinaMobile PLC Wireless Router model GPN2.4P21-C-CN running the firmware version W2000EN-01(hardware platform Gpn2.4P21-C_WIFI-V0.05), via the getpage parameter to /cgi-bin/webproc.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2023-01-26 · 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: 0.013 (69.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Chinamobileltd Gpn2.4p21-C-Cn — versions 0.05
Chinamobileltd Gpn2.4p21-C-Cn Firmware — versions w2000en-01

Weakness classification (CWE)

CWE-22 — Path Traversal

References

medium.com/@SergiuSechel/insecure-permissions-and-multiple-vulnerabilities-in-c…
github.com/cybertoxin/CVEs/blob/main/CVE_2020_18331.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-18331?: CVE-2020-18331 is a critical-severity vulnerability in Chinamobileltd Gpn2.4p21-C-Cn, classified under Path Traversal. CVSS score: 9.1/10. Published 2023-01-26.
How severe is CVE-2020-18331?: Critical severity. CVSS v3 base score is 9.1 out of 10.