{"schemaVersion":3,"id":"CVE-2021-31319","aliases":["UBUNTU-CVE-2021-31319"],"status":"published","duplicateOf":null,"title":null,"description":"Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by an Integer 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.","dates":{"published":"2021-05-18T19:44:26.000Z","modified":"2024-08-03T22:55:53.457Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","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","exploitability":4.6,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":4.3,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01288,"percentile":0.69801,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01288},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01288,"percentile":0.69801}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01288,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01288,"percentile":0.69801}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_5B95AB5608D59600","name":"Exploit Reference (shielder.it)","source":"reference","url":"https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_1D9B6F1E028A391E","name":"Exploit Reference (shielder.it)","source":"reference","url":"https://www.shielder.it/advisories/telegram-rlottie-lotgradient-populate-integer-overflow/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":2,"weaknesses":[{"id":"CWE-190","name":"Integer Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"}],"affected":[{"vendor":"ubuntu","product":"rlottie","name":"rlottie","label":"rlottie","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/rlottie","purlType":"deb","versions":[{"text":"< 0~git20200305.a717479+dfsg-1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0~git20200305.a717479+dfsg-1ubuntu0.1~esm1","eol":null,"hubHref":null},{"vendor":"telegram","product":"telegram","name":"Telegram","label":"telegram","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 7.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.1.0","eol":null,"hubHref":"/vendor/telegram/telegram"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/","label":"www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/","hostname":"www.shielder.it","tags":["X Refsource MISC","Exploit","Third Party Advisory"]},{"url":"https://www.shielder.it/advisories/telegram-rlottie-lotgradient-populate-integer-overflow/","label":"www.shielder.it/advisories/telegram-rlottie-lotgradient-populate-integer-overflow/","hostname":"www.shielder.it","tags":["X Refsource MISC","REPORT","Exploit","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-31319","label":"ubuntu.com/security/CVE-2021-31319","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-31319","label":"www.cve.org/CVERecord?id=CVE-2021-31319","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-7198-1","label":"ubuntu.com/security/notices/USN-7198-1","hostname":"ubuntu.com","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["USN-7198-1"],"duplicates":[],"related":["USN-7198-1"]},"timeline":[{"kind":"published","date":"2021-05-18T19:44:26.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T22:55:53.457Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T22:46:49.070Z","stale":false,"partial":false}}