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Cisco Bug: CSCvs50534 - Telegram application is sometimes not detected

Last Modified

Mar 06, 2020

Products (1)

  • Cisco Firepower Management Center

Known Affected Releases


Description (partial)

Occasionally Telegram application is not detected

Certain IP addresses from the Telegram CIDR are used, IP addresses which do not appear in our detectors.

Testing conditions: We can send and receive the message, send images and other media from inside to outside but cant receive images and other media from outside to inside. Customer found the issue using mobile app on android 7 (moto e4) , windows phone 10 and iphone (IOS 12.4). They have an allow rule for Telegram and a default block rule.
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Bug Details Include

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