{"id":"CVE-2021-31322","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-31322","generatedAt":"2026-10-27T23:38:45.828Z","title":"Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Heap Buffer Overflow in the LOTGradient::populate function of their custom fork of the rlottie library.","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 LOTGradient::populate function of their custom fork of the rlottie library. A remote attacker might be able to access heap memory out-of-bounds on a victim device via a malicious animated sticker.","published":"2021-05-18T20:15:08.000Z","lastModified":"2026-06-17T03:51:33.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},"cwe":["CWE-787"],"affected":["telegram/telegram"],"epss":{"score":0.01425,"percentile":0.72731,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.43%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://www.shielder.it/advisories/telegram-rlottie-lotgradient-populate-heap-buffer-overflow/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.shielder.it/advisories/telegram-rlottie-lotgradient-populate-heap-buffer-overflow/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-31322","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}