CVE-2019-17191

Name: CVE-2019-17191
Creator: NVD / NIST
Published: 2019-10-05T02:15:11.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.80%

Last modified Jun 17, 2026

CVE-2019-17191 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The Signal Private Messenger application before 4.47.7 for Android allows a caller to force a call to be answered, without callee user interaction, via a connect message. The existence of the call is noticeable to the callee; however, the audio channel may be open before the callee can block eavesdropping.. EPSS estimates a 1.80% chance of exploitation in the next 30 days.

Description

The Signal Private Messenger application before 4.47.7 for Android allows a caller to force a call to be answered, without callee user interaction, via a connect message. The existence of the call is noticeable to the callee; however, the audio channel may be open before the callee can block eavesdropping.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.80%

75.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Signal	Private Messenger	< 4.47.7

References

https://bugs.chromium.org/p/project-zero/issues/detail?id=1943Exploit, Third Party Advisory
https://news.ycombinator.com/item?id=21161432Exploit, Issue Tracking, Third Party Advisory
https://twitter.com/moxie/status/1180261210341511168Third Party Advisory
https://bugs.chromium.org/p/project-zero/issues/detail?id=1943Exploit, Third Party Advisory
https://news.ycombinator.com/item?id=21161432Exploit, Issue Tracking, Third Party Advisory
https://twitter.com/moxie/status/1180261210341511168Third Party Advisory

Timeline

Published: Oct 5, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-17191?

How severe is CVE-2019-17191?

CVE-2019-17191 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.80% probability of exploitation in the next 30 days.

How do I fix CVE-2019-17191?

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-2019-17191?

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

Scan your code now

Source: NVD / NIST