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TI-2021-22409 Aliases CVE-2021-47793GHSA-4gqj-v3rw-hwjg

Telegram Desktop 2.9.2 - Denial of Service (PoC)

Priority MEDIUM 54CWE-770Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00501 43rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TelegramTelegram Desktop2.9.2—No fix listedCNA
  • Telegram Desktop VendorTelegram Affected 2.9.2 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:telegram:telegram_desktop:2.9.2:*:*:*:*:*:*:*2.9.2VulnerableTelegram
  • cpe:2.3:a:telegram:telegram_desktop:2.9.2:*:*:*:*:*:*:* Versions 2.9.2 Vulnerable ·Telegram

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-47793
  2. 2026-10-03 Alias added: GHSA-4gqj-v3rw-hwjg

References

Exploit 1

Other 1

  • TI-2018-12545 Telegram Desktop (aka tdesktop) 1.3.16 alpha, when "Use proxy" is enabled, sends… CVSS 3.0CRITICAL 9.8
  • TI-2019-07370 Telegram Desktop before 1.5.12 on Windows, and the Telegram applications for Android… CVSS 3.0HIGH 8.8
  • TI-2020-13213 Telegram Desktop through 2.1.13 allows a spoofed file type to bypass the Dangerous File… CVSS 3.1HIGH 7.8
  • TI-2018-12317 Telegram Desktop (aka tdesktop) 1.3.14 might allow attackers to cause a denial of service… CVSS 3.0HIGH 7.5
  • TI-2020-09975 Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through… CVSS 3.1MEDIUM 6.5
  • TI-2018-12653 Telegram Desktop (aka tdesktop) 1.3.14, and Telegram 3.3.0.0 WP8.1 on Windows, leaks… CVSS 3.0MEDIUM 6.5
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences