CVE-2021-47793
Telegram Desktop 2.9.2 - Denial of Service (PoC)
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.
INFO
Published Date :
Jan. 16, 2026, 12:16 a.m.
Last Modified :
Jan. 30, 2026, 12:56 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Telegram Desktop application.
- Avoid pasting excessively large text.
- Report the issue to the vendor.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47793.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47793 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47793
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47793 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47793 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 30, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:telegram:telegram_desktop:2.9.2:*:*:*:*:*:*:* Added Reference Type VulnCheck: https://telegram.org Types: Product Added Reference Type VulnCheck: https://www.exploit-db.com/exploits/50247 Types: Exploit Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc Types: Third Party Advisory Added Reference Type CISA-ADP: https://www.exploit-db.com/exploits/50247 Types: Exploit -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 16, 2026
Action Type Old Value New Value Added Reference https://www.exploit-db.com/exploits/50247 -
New CVE Received by [email protected]
Jan. 16, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://telegram.org Added Reference https://www.exploit-db.com/exploits/50247 Added Reference https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc