CVE-2021-31320 Memory corruption in n/a

Q: Is CVE-2021-31320 being exploited?

There is no known exploitation of CVE-2021-31320 in the wild and no public exploit code.

High 7.1 Published 18 May 2021 Updated 3 Aug 2024

A remote attacker can execute arbitrary code on Telegram clients by sending a malicious animated sticker that triggers a heap buffer overflow.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2021-31320?

CVE-2021-31320 is a high-severity memory corruption vulnerability in n/a, published on 18 May 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Heap Buffer Overflow in the VGradientCache::generateGradientColorTable function of their custom fork of the rlottie library. A remote attacker might be able to overwrite heap memory out-of-bounds on a victim device via a malicious animated sticker.

Weakness: CWE-787

Which versions are affected by CVE-2021-31320?

It affects 1 product.

Products include Telegram Telegram.

How do I fix CVE-2021-31320?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-31320 being exploited?

There is no known exploitation of CVE-2021-31320 in the wild and no public exploit code.

Sources

Also known as GHSA-6hrw-8fx7-cp46, UBUNTU-CVE-2021-31320.