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Fencer Intel
high 7.5

CVE-2019-17191 json

The Signal Private Messenger application before 4.47.7 for Android allows a caller to force a call to be answered, without callee user inte…

published 7y ago modified 4mo ago also EUVD-2019-7623

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

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.

Patch / fix

  • signal private_messenger 4.47.7

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Exploit prediction

1.76% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • news.ycombinator.com https://news.ycombinator.com/item?id=21161432 referenced PoC, tagged "exploit" by a source, unverified
  • bugs.chromium.org https://bugs.chromium.org/p/project-zero/issues/detail?id=1943 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.