CVE-2021-47793
BaseFortify
Publication date: 2026-01-16
Last updated on: 2026-01-16
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| telegram | telegram_desktop | 2.9.2 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-770 | The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in Telegram Desktop version 2.9.2 is a denial of service (DoS) issue caused by the application's improper handling of very large message payloads. An attacker can create and paste an oversized message, approximately 9 million bytes in size, into the messaging interface. This large input overwhelms the application, causing it to crash. [1, 3]
How can this vulnerability impact me? :
The impact of this vulnerability is that an attacker can cause the Telegram Desktop application to crash by sending or pasting an extremely large message payload. This results in a denial of service, disrupting the normal use of the application. The attack requires local access and user interaction but does not require any special privileges. [1, 3]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by attempting to reproduce the denial of service condition on Telegram Desktop 2.9.2. Specifically, you can generate a large payload (approximately 9 million bytes) and paste it into the Telegram Desktop messaging interface to see if the application crashes. A proof-of-concept involves creating a file with 9 million 'A' characters and pasting its content into the 'Saved Messages' chat input field. There are no specific network detection commands provided, as the attack is local and requires user interaction. [3]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include avoiding pasting or sending extremely large message payloads (around 9 million bytes) in Telegram Desktop version 2.9.2. Users should update Telegram Desktop to a version where this vulnerability is fixed if available. Additionally, exercising caution with messages and disabling or restricting the use of large clipboard pastes in the application can help prevent triggering the denial of service. [1, 3]