CVE-2019-9970

Name: CVE-2019-9970
Creator: NVD / NIST
Published: 2019-03-24T02:29:00.67+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.83%

Last modified Jun 17, 2026

CVE-2019-9970 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.83% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.83%

76.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Signal	Private Messenger	<= 4.35.3
Signal	Signal-Desktop	<= 1.23.1

References

http://www.securityfocus.com/bid/107550Third Party Advisory, VDB Entry
https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txtThird Party Advisory
http://www.securityfocus.com/bid/107550Third Party Advisory, VDB Entry
https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txtThird Party Advisory

Timeline

Published: Mar 24, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9970?

How severe is CVE-2019-9970?

Severity scoring for CVE-2019-9970 is pending analysis. The EPSS model estimates a 1.83% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9970?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9970?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST