CVE-2020-18331: Directory traversal vulnerability in ChinaMobile PLC Wireless Router model GPN2.4P21-C-CN running the firmware

This week

CRITICAL 9.1REMOTEMITIGATE

CVE-2020-18331 is a critical-severity flaw (CVSS 9.1) affecting gpn2.4p21-c-cn firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-22
Published	2023-01-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chinamobileltd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-01-26 21:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

chinamobileltd gpn2.4p21-c-cn firmware MITIGATE

Affected: w2000en-01

Fixed in: no fixed release known

Safe to downgrade to: a release before w2000en-01

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-18331?

gpn2.4p21-c-cn firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-18331 being exploited?

CVE-2020-18331 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-18331 affect?

CVE-2020-18331 affects gpn2.4p21-c-cn firmware. Severity is critical (CVSS 9.1). 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.

How urgent is CVE-2020-18331?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Wi-Fi vulnerabilities

Related CVEs

CVE-2020-18330 CRITICAL 9.1 MITIGATE An issue was discovered in the default configuration of ChinaMobile PLC Wireless Router model GPN2.4P21-C-CN r

References

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