How severe is CVE-2019-17191?

CVE-2019-17191 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2019-17191 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-17191?

CVE-2019-17191 affects Signal Private Messenger. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-17191?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-17191 published?

CVE-2019-17191 was published on 2019-10-05 and last updated on 2026-06-17.

CVE-2019-17191

CVE-2019-17191 is a high-severity vulnerability in Signal Private Messenger with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Signal Private Messenger
Published: 2019-10-05
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-17191?: 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.
How severe is CVE-2019-17191?: CVE-2019-17191 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2019-17191 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-17191?: CVE-2019-17191 affects Signal Private Messenger. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-17191?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-17191 published?: CVE-2019-17191 was published on 2019-10-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:signal:private_messenger:*:*:*:*:*:android:*:*

More vulnerabilities in Signal Private Messenger

CVE-2019-17192 — Critical (CVSS 9.8): The WebRTC component in the Signal Private Messenger application through 4.47.7 for Android processes videoconferencing…
CVE-2019-9970 — Medium (CVSS 6.5): Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for…
CVE-2020-5753 — Medium (CVSS 5.3): Signal Private Messenger Android v4.59.0 and up and iOS v3.8.1.5 and up allows a remote non-contact to ring a victim's…
CVE-2018-3988 — Medium (CVSS 4.7): Signal Messenger for Android 4.24.8 may expose private information when using "disappearing messages." If a user uses…

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