CVE-2021-47793

Name: CVE-2021-47793
Creator: NVD / NIST
Published: 2026-01-16T00:16:23.207+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.6/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2021-47793 is a medium-severity vulnerability rated 4.6/10 on the CVSS scale. 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.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

4.6/10

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

EPSS Probability

0.45%

36.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Telegram	Telegram Desktop	2.9.2

References

https://telegram.orgProduct
https://www.exploit-db.com/exploits/50247Exploit
https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-pocThird Party Advisory
https://www.exploit-db.com/exploits/50247Exploit

Timeline

Published: Jan 16, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-47793?

How severe is CVE-2021-47793?

CVE-2021-47793 has a CVSS score of 4.6/10 (MEDIUM severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2021-47793?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-47793?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST