Denial of Service Vulnerability in Sticky Notes Widget by WordPress
CVE-2021-47973

8.7HIGH

Key Information:

Vendor

Sticky-notes

Status
Sticky Notes Widget
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47973?

The Sticky Notes Widget version 3.0.6 includes a denial of service vulnerability that can be exploited by an attacker to crash the application on iOS devices. By pasting excessively long character strings—up to 350,000 repeated characters—into the note field, the application can become unresponsive. This vulnerability exposes users to potential data loss and impacts the reliability of the application, making it crucial for users to apply necessary updates or mitigations.

Affected Version(s)

Sticky Notes Widget 3.0.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47973 - Proof of Concept

References

https://www.exploit-db.com/exploits/49978
exploit
https://www.vulncheck.com/advisories/sticky-notes-widget-...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Geovanni Ruiz
.