CVE-2021-31320

Public Exploit

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.

Category

7.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.30%
Third-Party Advisory shielder.it Third-Party Advisory shielder.it
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/ third party advisory exploit
https://www.shielder.it/advisories/telegram-rlottie-vgradientcache-generategradientcolortable-heap-buffer-overflow/ third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-31320?
CVE-2021-31320 has been scored as a high severity vulnerability.
How to fix CVE-2021-31320?
To fix CVE-2021-31320, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-31320 being actively exploited in the wild?
It is possible that CVE-2021-31320 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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