Vulnerability · Published Jan 15, 2026 · Assigned by VulnCheck
CVE-2021-47793Telegram Desktop 2.9.2 - Denial of Service (PoC)
High 7.5
In plain English
A high-severity resource allocation without limits in Telegram Desktop from Telegram. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 56.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | telegram-desktop | no fix listed | DEBIAN-CVE-2021-47793 |
| Debian:14 | telegram-desktop | no fix listed | DEBIAN-CVE-2021-47793 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Telegram | Telegram Desktop | 2.9.2 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- ExploitDB-50247 exploit
- Official Telegram Homepage product
- VulnCheck Advisory: Telegram Desktop 2.9.2 - Denial of Service (PoC) third-party-advisory