CVE-2020-28713Public exploitNetwork attack vector

Notification spoofing via unauthenticated PNS requests

Published Jun 8, 2021 · Updated Aug 4, 2024

Authentication bypass in Night Owl Smart Doorbell firmware 20190505 allows remote attackers to spoof push notifications through its PNS API. The exposed /tpns endpoint accepts plaintext HTTP GET requests containing a device UID, event type, and timestamp without authenticating the sender. A doorbell UID is required; captured or crafted requests expose event data and create false motion or doorbell alerts, while repeated requests can flood the mobile application.

CVSS severity6.5
Medium
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Night Owl Smart Doorbell firmware 20190505 allows remote attackers to spoof push notifications through its PNS API. The exposed /tpns endpoint accepts plaintext HTTP GET requests containing a device UID, event type, and timestamp without authenticating the sender. A doorbell UID is required; captured or crafted requests expose event data and create false motion or doorbell alerts, while repeated requests can flood the mobile application.

The record

CVE
CVE-2020-28713
Published
Jun 8, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-294, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:P
6.5NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
T1565.002Transmitted Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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