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.

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 interf…

EPSS: 0.005 (36.0th percentile) — read the EPSS interpretation.

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.

Affected products

Telegram Desktop — versions 2.9.2
Telegram Telegram_desktop — versions 2.9.2

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

disclosure@vulncheck.com (Exploit, exploit)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (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.