CVE-2023-33768Public exploitNetwork attack vector

Device bricking via invalid firmware signature handling

Published Jul 13, 2023 · Updated Oct 30, 2024

Improper firmware signature verification in Belkin Wemo WiFi Smart Plug WSP080 1.2 allows attackers to brick the device with crafted firmware. During a mobile-app-initiated Device Firmware Update, the plug processes a firmware binary despite an invalid signature; changing one byte makes it stop responding. The demonstrated path requires pairing the plug with the Wemo app and substituting the firmware URL or binary during delivery, after which the plug cannot be reset or detected by the app.

CVSS severity6.5
Medium
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper firmware signature verification in Belkin Wemo WiFi Smart Plug WSP080 1.2 allows attackers to brick the device with crafted firmware. During a mobile-app-initiated Device Firmware Update, the plug processes a firmware binary despite an invalid signature; changing one byte makes it stop responding. The demonstrated path requires pairing the plug with the Wemo app and substituting the firmware URL or binary during delivery, after which the plug cannot be reset or detected by the app.

The record

CVE
CVE-2023-33768
Published
Jul 13, 2023
Updated
Oct 30, 2024
Vendor
Belkin
Product
Wemo WiFi Smart Plug
Classifications
CWE-347, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Belkin · Wemo WiFi Smart Plugversion=1.2

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-347Improper Verification of Cryptographic Signature
T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo