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Citrix, Sophos software impacted by 2024 leap year bugs

ID: 1dac44c9-d5d9-51f3-aa84-a126736e1bb7

STIX ID: report--1dac44c9-d5d9-51f3-aa84-a126736e1bb7

Feed Name: Bleeping Computer

Threat Score
15/100

Date Published: 2024-02-29

Date Updated: 2026-04-20

Author: Bill Toulas

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The report describes widespread leap-year software defects on February 29, 2024 that caused service outages and security-product malfunctions — notably Citrix's HDX HTML5 Video Redirection Service failing after VDA restarts and Sophos producing HTTPS certificate validation warnings when SSL/TLS decryption was enabled; vendors issued workarounds, disabled problematic features for customers, and are preparing permanent fixes.

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