What is the CVSS score of CVE-2021-47793?

CVE-2021-47793 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Telegram Desktop are affected by CVE-2021-47793?

Organizations using Telegram Desktop 2.9.2 face notable risk from CVE-2021-47793 rated CVSS 7.5. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2021-47793?

Yes, a public proof-of-concept exploit is available for CVE-2021-47793. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47793?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

Telegram Desktop CVE-2021-47793

HIGH

Allocation of Resources Without Limits or Throttling (CWE-770)

2026-01-16 disclosure@vulncheck.com

Denial Of Service Telegram Desktop Telegram

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 30, 2026 - 00:56 vuln.today

Public exploit code

CVE Published

Jan 16, 2026 - 00:16 nvd

HIGH 7.5

DescriptionCVE.org

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.

AnalysisAI

Telegram Desktop versions up to 2.9.2 is affected by allocation of resources without limits or throttling (CVSS 7.5).

Technical ContextAI

This vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affects Telegram Desktop. 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.