CVE-2021-47793

HIGH

Telegram Desktop 2.9.2 - Denial of Service via Oversized Message Payload

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47793. PoCs published by Aryan Chehreghani.

AI-analyzed exploit summary This PoC generates a large buffer of 'A' characters (9,000,000 bytes) and writes it to a file. When pasted into Telegram Desktop's 'Saved Messages', it triggers a denial of service (crash).

Description

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.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Aryan Chehreghani · pythondoswindows
https://www.exploit-db.com/exploits/50247

This PoC generates a large buffer of 'A' characters (9,000,000 bytes) and writes it to a file. When pasted into Telegram Desktop's 'Saved Messages', it triggers a denial of service (crash).

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Telegram Desktop 2.9.2 x64
No auth needed
Prerequisites: Telegram Desktop 2.9.2 x64 installed on Windows 10 Enterprise · Ability to paste large text into Telegram's 'Saved Messages'
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Product product
https://telegram.org

Scores

CVSS v3 7.5
EPSS 0.0045
EPSS Percentile 35.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (1)
telegram/telegram_desktop 2.9.2
Published Jan 16, 2026
Tracked Since Feb 18, 2026