Denial of Service Vulnerability in Telegram Desktop by Telegram
CVE-2021-47793

4.6MEDIUM

Key Information:

Vendor

Telegram

Status
Telegram Desktop
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47793?

Telegram Desktop version 2.9.2 is susceptible to a denial of service vulnerability that enables attackers to crash the application. This vulnerability is exploited by sending an oversized message payload, with the capability to generate a buffer of up to 9 million bytes, effectively causing the application to crash when pasted into the messaging interface. Users should take precautions to mitigate potential risks associated with this vulnerability.

Affected Version(s)

Telegram Desktop 2.9.2

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-2021-47793 - Proof of Concept

References

https://www.exploit-db.com/exploits/50247
exploit
https://telegram.org
product
https://www.vulncheck.com/advisories/telegram-desktop-den...
third-party-advisory

CVSS V4

Score:
4.6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Aryan Chehreghani
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