Vulnerability Report

CVE-2021-47793

Title: DoS in Telegram Desktop

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2021-47793.

CWE Category CWE-770

Published Date Jan 16, 2026

Modified Date Jan 30, 2026

Exploit Status Not Found

Score 4.6 CVSS v4.0

Exploit Probability (EPSS)

0.45%

Vulnerability Summary

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.

Impacted Vendors

telegram_desktop 1

telegram 1

Reference Links

https://telegram.org https://www.exploit-db.com/exploits/50247 https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc

CVSS v4.0

Source Entity [email protected]

Severity MEDIUM

4.6

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

ACTIVE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns