CVE-2021-30496

Name: CVE-2021-30496
Creator: NVD / NIST
Published: 2021-04-20T16:15:10.59+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.7/10EPSS 1.18%

Last modified Jun 17, 2026

CVE-2021-30496 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. The Telegram app 7.6.2 for iOS allows remote authenticated users to cause a denial of service (application crash) if the victim pastes an attacker-supplied message (e.g., in the Persian language) into a channel or group. The crash occurs in MtProtoKitFramework. EPSS estimates a 1.18% chance of exploitation in the next 30 days.

Description

The Telegram app 7.6.2 for iOS allows remote authenticated users to cause a denial of service (application crash) if the victim pastes an attacker-supplied message (e.g., in the Persian language) into a channel or group. The crash occurs in MtProtoKitFramework. NOTE: the vendor's perspective is that "this behavior can't be considered a vulnerability."

Metrics

CVSS 3.1

5.7/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.18%

63.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-121

Affected Software

Vendor	Product	Versions
Telegram	Telegram	7.6.2

References

https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31Exploit, Third Party Advisory
https://t.me/joinchat/bJ9cnUosVh03ZTI0Vendor Advisory
https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31Exploit, Third Party Advisory
https://t.me/joinchat/bJ9cnUosVh03ZTI0Vendor Advisory

Timeline

Published: Apr 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30496?

How severe is CVE-2021-30496?

CVE-2021-30496 has a CVSS score of 5.7/10 (MEDIUM severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30496?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30496?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST