HOMEVULNERABILITIESCVE-2019-9970
MEDIUM

CVE-2019-9970

NVD-CWE-noinfoPublished: March 24, 2019· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.

NVD Source

Technical Analysis

CVE-2019-9970 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected Vendors & Products

signal2 product(s)
private messengersignal-desktop
Source: NVD CPE · 2 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

ADVISORYhttp://www.securityfocus.com/bid/107550
ADVISORYhttps://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txt
ADVISORYhttp://www.securityfocus.com/bid/107550
ADVISORYhttps://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txt

All References (4)

→
http://www.securityfocus.com/bid/107550Third Party Advisory · VDB Entry
→
https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txtThird Party Advisory
→
http://www.securityfocus.com/bid/107550Third Party Advisory · VDB Entry
→
https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txtThird Party Advisory

Quick Facts

CVE IDCVE-2019-9970
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedMar 24, 2019

Related CVEs (NVD-CWE-noinfo)

CVE-2023-45894
10.0
CVE-2022-21390
10.0
CVE-2019-25136
10.0
CVE-2022-21275
10.0
CVE-2022-21389
10.0
CVE-2024-22216
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-9970 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.
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