VULNERABILITY INTELLIGENCE

CVE-2019-9970

CVSS score6.5 MEDIUM

EPSS probability1.83%

CISA KEVNot currently listed

Published2019-03-24

Last modified2026-06-17

CVSS vectorCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Description

Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.

Primary references

cve@mitre.org — Third Party Advisory, VDB Entry
cve@mitre.org — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory