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Fencer Vulns
medium 5.3

CVE-2021-36769 json

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.

published 2021-07-16 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-23357

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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.

Patch / fix

  • telegram telegram 7.8.1, 7.8.3
  • telegram telegram_desktop 2.8.8
  • telegram-desktop Debian 14, Debian 12 2.9.2+ds-1

debian advisories DEBIAN-CVE-2021-36769

  • telegram-desktop Arch Linux 2.8.11-1

arch linux advisories AVG-2170

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.