CVE-2021-36769

A reordering issue exists in Telegram before 7.8.1 for Android, Telegram before 7.8.3 for iOS,...

5.3 MediumFix available

A reordering issue exists in Telegram before 7.8.1 for Android, Telegram before 7.8.3 for iOS, and Telegram Desktop before 2.8.8. An attacker can cause the server to receive messages in a different order than they were sent a client.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

1.39%Up 1.0 points since Jul 17, 2021

What each source reports

NVD Score used 5.3

Record: CVE-2021-36769
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-36769
Updated: 2026-11-02

EUVDEUVD-2021-23357 No score

Record: EUVD-2021-23357
Updated: 2026-11-03

GitHub AdvisoriesGHSA-phpw-4p8w-67hr 5.3

A reordering issue exists in Telegram before 7.8.1 for Android, Telegram before 7.8.3 for iOS,...

Record: GHSA-phpw-4p8w-67hr
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-326
Updated: 2026-11-02

OSV 5.3

Record: CVE-2021-36769
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-36769 5.3

Record: DEBIAN-CVE-2021-36769
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-36769 5.3

Record: UBUNTU-CVE-2021-36769
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`telegram-desktop` Debian:12	before 2.9.2+ds-1	2.9.2+ds-1
`telegram-desktop` Debian:14	before 2.9.2+ds-1, plus listed versions 1.0.14-11.0.29-11.1.0-11.1.10-11.1.18-1 Show 45 moreShow less 1.1.19-11.1.19-21.1.23-11.1.23-1~bpo9+11.1.23-21.1.23-31.2.1-11.2.1-21.2.15-11.2.17-11.2.6-11.2.6-21.3.10-11.3.10-21.3.14-11.3.7-11.4.0-11.5.11-11.5.2-11.5.4-11.5.8-11.7.0-11.7.14-11.8.15-11.8.15-21.8.15-2~bpo10+11.8.2-11.8.2-21.8.4-11.8.8-11.9.14+ds-11.9.14+ds-21.9.21+ds-11.9.8~slim-12.0.1+ds-12.1.0+ds-12.1.4+ds-12.1.5+ds-12.1.7+ds-12.1.7+ds-22.2.0+ds-12.2.0+ds-22.2.0+ds-2~bpo10+12.2.0+ds-32.2.0+ds-4	2.9.2+ds-1
`telegram-desktop` Ubuntu:18.04:LTS	All versions, plus listed versions 1.1.23-11.1.23-1build11.1.23-21.1.23-31.2.6-1 Show 7 moreShow less 1.2.6-21.2.6-2build11.2.6-2build21.2.6-2build31.2.15-11.2.15-1build11.2.17-1	None known
`telegram-desktop` Ubuntu:20.04:LTS	All versions, plus listed versions 1.8.8-11.8.15-21.9.8~slim-11.9.14+ds-11.9.14+ds-2 Show 5 moreShow less 1.9.21+ds-12.0.1+ds-12.0.1+ds-1build12.1.7+ds-2~ubuntu20.04.13.1.1+ds-1~ubuntu20.04.1	None known
`telegram-desktop` Ubuntu:22.04:LTS	All versions, plus listed versions 3.1.1+ds-13.5.2+ds-13.6.1+ds-2build1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-36769 is a medium vulnerability (CVSS 5.3) in Telegram, published July 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.39%, the 72nd percentile. Fixed in telegram-desktop 2.9.2+ds-1.

References

This page doesn't list everything

Left out here: 9 versions. The JSON record has them.