High severity · published Jan 15, 2026
CVE-2021-47793
Telegram Desktop 2.9.2 - Denial of Service (PoC)
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TD
Telegram Desktop · Telegram
2.9.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47793
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-47793
Product
https://telegram.org
Exploit
https://www.exploit-db.com/exploits/50247
Third Party Advisory
https://www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc
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