CVE-2021-47793

Telegram Desktop 2.9.2 contains a denial of service vulnerability that allows attackers to crash the application by sending an oversized message payload. Attackers can generate a 9 million byte buffer and paste it into the messaging interface to trigger an application crash.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://telegram.org	Product
https://www.exploit-db.com/exploits/50247	Exploit
https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc	Third Party Advisory
https://www.exploit-db.com/exploits/50247	Exploit

Configurations

Configuration 1 (hide)

cpe:2.3:a:telegram:telegram_desktop:2.9.2:*:*:*:*:*:*:*

History

17 Jun 2026, 04:18

Type	Values Removed	Values Added
Summary		(es) Telegram Desktop 2.9.2 contiene una vulnerabilidad de denegación de servicio que permite a los atacantes colapsar la aplicación al enviar una carga útil de mensaje sobredimensionada. Los atacantes pueden generar un búfer de 9 millones de bytes y pegarlo en la interfaz de mensajería para desencadenar un colapso de la aplicación.

30 Jan 2026, 00:56

Type	Values Removed	Values Added
First Time		Telegram telegram Desktop Telegram
References	~~() https://telegram.org -~~	() https://telegram.org - Product
References	~~() https://www.exploit-db.com/exploits/50247 -~~	() https://www.exploit-db.com/exploits/50247 - Exploit
References	~~() https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc -~~	() https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc - Third Party Advisory
CPE		cpe:2.3:a:telegram:telegram_desktop:2.9.2:::::::*

16 Jan 2026, 22:16

Type	Values Removed	Values Added
References	~~() https://www.exploit-db.com/exploits/50247 -~~	() https://www.exploit-db.com/exploits/50247 -

16 Jan 2026, 00:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-01-16 00:16

Updated : 2026-06-17 04:18

NVD link : CVE-2021-47793

Mitre link : CVE-2021-47793

CVE.ORG link : CVE-2021-47793

JSON object : View

Products Affected

telegram

telegram_desktop

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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