What’s Vulnerable › Vulnerabilities

CVE-2019-17191

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-10-05 · updated 2026-06-17
• Weakness: CWE-863

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.

Affected products

• Signal Private Messenger: before 4.47.7 — fixed in 4.47.7

How to fix

Upgrade to a fixed version: Signal Private Messenger 4.47.7. Check the vendor advisory for mitigations.

References

• https://bugs.chromium.org/p/project-zero/issues/detail?id=1943
• https://news.ycombinator.com/item?id=21161432
• https://twitter.com/moxie/status/1180261210341511168
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1943
• https://news.ycombinator.com/item?id=21161432
• https://twitter.com/moxie/status/1180261210341511168

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