Resource exhaustion in Telegram Desktop
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Telegram Desktop — versions 2.9.2
- Telegram Desktop — versions 2.9.2
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/50247 (Exploit, exploit)
- telegram.org (Product, product)
- www.vulncheck.com/advisories/telegram-desktop-denial-of-service-poc (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2021-47793?
- CVE-2021-47793 is a high-severity vulnerability in Telegram Desktop, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-01-16.
- How severe is CVE-2021-47793?
- High severity. CVSS v3 base score is 7.5 out of 10.