CVE-2021-31321

HIGH
Published May 18, 20215y ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published May 18, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Stack Based Overflow in the gray_split_cubic function of their custom fork of the rlottie library. A remote attacker might be able to overwrite Telegram's stack memory out-of-bounds on a victim device via a malicious animated sticker.

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity High
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 3

VendorProductVersionRange
telegramtelegram* <7.1.0
telegramtelegram* <7.1.0
telegramtelegram* <7.1.0

References 2

  • shielder.it https://www.shielder.it/advisories/telegram-rlottie-gray_split_cubic-stack-buffer-overflow/
    ExploitThird Party Advisory
  • shielder.it https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/
    ExploitThird Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.