CVE-2020-28998: An issue was discovered on Geeni GNC-CW013 doorbell 1.8.1 devices

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CRITICAL 9.8REMOTEMITIGATE

CVE-2020-28998 is a critical-severity flaw (CVSS 9.8) affecting gnc-cw013 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered on Geeni GNC-CW013 doorbell 1.8.1 devices. A vulnerability exists in the Telnet service that allows a remote attacker to take full control of the device with a high-privileged account. The vulnerability exists because a system account has a default and static password.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-798
Published	2021-01-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mygeeni

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

Am I affected?

Timeline

2021-01-26 18:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

mygeeni gnc-cw013 firmware MITIGATE

Affected: 1.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.8.1

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-2020-28998?

gnc-cw013 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-28998 being exploited?

CVE-2020-28998 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-2020-28998 affect?

CVE-2020-28998 affects gnc-cw013 firmware. Severity is critical (CVSS 9.8). An issue was discovered on Geeni GNC-CW013 doorbell 1.8.1 devices. A vulnerability exists in the Telnet service that allows a remote attacker to take full control of the device with a high-privileged account. The vulnerability exists becaus

How urgent is CVE-2020-28998?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-29000 HIGH 7.2 MITIGATE An issue was discovered on Geeni GNC-CW013 doorbell 1.8.1 devices
CVE-2020-28999 HIGH 7.2 MITIGATE An issue was discovered in Apexis Streaming Video Web Application on Geeni GNC-CW013 doorbell 1.8.1 devices

References

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