CVE-2021-27351

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through...

5.3 MediumFix available

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

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

0.84%Up 0.4 points since Apr 14, 2021

What each source reports

NVD Score used 5.3

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

Record: CVE-2021-27351
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
Weakness: CWE-613
Updated: 2026-11-02

CVE List No score

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

Record: CVE-2021-27351
Updated: 2026-11-02

EUVDEUVD-2021-14111 No score

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

Record: EUVD-2021-14111
Updated: 2026-11-03

GitHub AdvisoriesGHSA-cc4r-2rwj-vx7x 5.3

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through...

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

Record: GHSA-cc4r-2rwj-vx7x
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-613
Updated: 2026-11-02

OSV 5.3

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

Record: CVE-2021-27351
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-2021-27351 5.3

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

Record: DEBIAN-CVE-2021-27351
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-2021-27351 5.3

The Terminate Session feature in the Telegram application through 7.2.1 for Android, and through 2.4.7 for Windows and UNIX, fails to invalidate a recently active session.

Record: UBUNTU-CVE-2021-27351
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 2.6.1-1	2.6.1-1
`telegram-desktop` Debian:14	before 2.6.1-1, 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	2.6.1-1
`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-2021-27351 is a medium vulnerability (CVSS 5.3) in Telegram, published February 19, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.84%, the 58th percentile. Fixed in telegram-desktop 2.6.1-1.

References

This page doesn't list everything

Left out here: 3 versions. The JSON record has them.