CVE-2021-36769: A reordering issue exists in Telegram before 7.8.1 for Android, Telegram before 7.8.3 for iOS, and Telegram De

Q: How do I fix CVE-2021-36769?

telegram: upgrade to 7.8.1; telegram: upgrade to 7.8.3; telegram desktop: upgrade to 2.8.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-36769 being exploited?

CVE-2021-36769 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-36769 affect?

CVE-2021-36769 affects telegram, telegram, telegram desktop. Severity is medium (CVSS 5.3). 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.

Q: How urgent is CVE-2021-36769?

Priority 42/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.3REMOTEUPGRADEUPGRADEUPGRADE

CVE-2021-36769 is a medium-severity flaw (CVSS 5.3) affecting telegram, telegram, telegram desktop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2021-07-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: telegram

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-17 00:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

telegram telegram UPGRADE

Affected: < 7.8.1

Fixed in: 7.8.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy telegram || rpm -q telegram || telegram --version

2. UPGRADE to 7.8.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade telegram

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade telegram

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

telegram telegram UPGRADE

Affected: < 7.8.3

Fixed in: 7.8.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy telegram || rpm -q telegram || telegram --version

2. UPGRADE to 7.8.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade telegram

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade telegram

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

telegram telegram desktop UPGRADE

Affected: < 2.8.8

Fixed in: 2.8.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy telegram-desktop || rpm -q telegram-desktop || telegram-desktop --version

2. UPGRADE to 2.8.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade telegram-desktop

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade telegram-desktop

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-36769?

telegram: upgrade to 7.8.1; telegram: upgrade to 7.8.3; telegram desktop: upgrade to 2.8.8. Exact commands for each OS are on this page.

Is CVE-2021-36769 being exploited?

CVE-2021-36769 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-36769 affect?

CVE-2021-36769 affects telegram, telegram, telegram desktop. Severity is medium (CVSS 5.3). 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.

How urgent is CVE-2021-36769?

Priority 42/100. Remotely exploitable, no login, no user action

Software pages

Android vulnerabilities · iOS vulnerabilities · Telegram vulnerabilities

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References

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