CVE-2020-28713: Incorrect access control in push notification service in Night Owl Smart Doorbell FW version 20190505 allows r

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MEDIUM 6.5REMOTEMITIGATE

CVE-2020-28713 is a medium-severity flaw (CVSS 6.5) affecting smart doorbell firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incorrect access control in push notification service in Night Owl Smart Doorbell FW version 20190505 allows remote users to send push notification events via an exposed PNS server. A remote attacker can passively record push notification events which are sent over an insecure web request. The web service does not authenticate requests, and allows attackers to send an indefinite amount of motion or doorbell events to a user's mobile application b

Why this priority

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	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-294
Published	2021-06-08
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

2021-06-08 19:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

nightowlsp smart doorbell firmware MITIGATE

Affected: 20190505

Fixed in: no fixed release known

Safe to downgrade to: a release before 20190505

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-2020-28713?

smart doorbell firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-28713 being exploited?

CVE-2020-28713 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-2020-28713 affect?

CVE-2020-28713 affects smart doorbell firmware. Severity is medium (CVSS 6.5). Incorrect access control in push notification service in Night Owl Smart Doorbell FW version 20190505 allows remote users to send push notification events via an exposed PNS server. A remote attacker can passively record push notification e

How urgent is CVE-2020-28713?

Priority 51/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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