CVE-2021-36769 Race condition in n/a

Medium 5.3 Published 16 Jul 2021 Updated 4 Aug 2024

An attacker can manipulate message ordering on the server, potentially altering the logical sequence of communications in Telegram clients.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-36769?

CVE-2021-36769 is a medium-severity vulnerability in n/a, published on 16 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A reordering issue exists in Telegram before 7.8.1 for Android, Telegram before 7.8.3 for iOS, and Telegram Desktop before 2.8.8. An attacker can cause the server to receive messages in a different order than they were sent a client.

Which versions are affected by CVE-2021-36769?

It affects 2 products.

Products include Telegram Telegram, Telegram Telegram Desktop.

How do I fix CVE-2021-36769?

Upgrade to a fixed version.

Is CVE-2021-36769 being exploited?

There is no known exploitation of CVE-2021-36769 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2021-36769, GHSA-phpw-4p8w-67hr, UBUNTU-CVE-2021-36769.