HOMEVULNERABILITIESCVE-2019-17191
HIGH

CVE-2019-17191

CWE-863Published: October 5, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-17191 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

signal1 product(s)
private messenger
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (6)

→
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

Quick Facts

CVE IDCVE-2019-17191
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-863
CISA KEVNo
Affected1 vendor(s)
PublishedOct 5, 2019

Related CVEs (CWE-863)

CVE-2023-4617
10.0
CVE-2021-38503
10.0
CVE-2026-48303
10.0
CVE-2026-48321
10.0
CVE-2020-13300
10.0
CVE-2026-48286
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-17191 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2019-17191·NVD