CVE-2021-31793: An issue exists on NightOwl WDB-20-V2 WDB-20-V2_20190314 devices that allows an unauthenticated user to gain a

This month

HIGH 7.5REMOTEMITIGATE

CVE-2021-31793 is a high-severity flaw (CVSS 7.5) affecting wdb-20 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue exists on NightOwl WDB-20-V2 WDB-20-V2_20190314 devices that allows an unauthenticated user to gain access to snapshots and video streams from the doorbell. The binary app offers a web server on port 80 that allows an unauthenticated user to take a snapshot from the doorbell camera via the /snapshot URI.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
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-306
Published	2021-05-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nightowlsp

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

Am I affected?

Timeline

2021-05-06 17:15 UTCPublished CVE record published
2026-06-17 03:52 UTCUpdated Record last modified

nightowlsp wdb-20 firmware MITIGATE

Affected: 20190314

Fixed in: no fixed release known

Safe to downgrade to: a release before 20190314

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-2021-31793?

wdb-20 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-31793 being exploited?

CVE-2021-31793 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-2021-31793 affect?

CVE-2021-31793 affects wdb-20 firmware. Severity is high (CVSS 7.5). An issue exists on NightOwl WDB-20-V2 WDB-20-V2_20190314 devices that allows an unauthenticated user to gain access to snapshots and video streams from the doorbell. The binary app offers a web server on port 80 that allows an unauthenticat

How urgent is CVE-2021-31793?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

References

← Back to latest CVEs