HOMEVULNERABILITIESCVE-2022-28345
HIGH

CVE-2022-28345

CWE-74Published: April 15, 2022· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

The Signal app before 5.34 for iOS allows URI spoofing via RTLO injection. It incorrectly renders RTLO encoded URLs beginning with a non-breaking space, when there is a hash character in the URL. This technique allows a remote unauthenticated attacker to send legitimate looking links, appearing to be any website URL, by abusing the non-http/non-https automatic rendering of URLs. An attacker can spoof, for example, example.com, and masquerade any URL with a malicious destination. An attacker requires a subdomain such as gepj, txt, fdp, or xcod, which would appear backwards as jpeg, txt, pdf, and docx respectively.

NVD Source

Technical Analysis

CVE-2022-28345 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 full integrity compromise (data manipulation), 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
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

signal1 product(s)
signal
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

PATCHhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2022-42.md
PATCHhttps://sick.codes/sick-2022-42
PATCHhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2022-42.md
PATCHhttps://sick.codes/sick-2022-42
ADVISORYhttps://blog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-whatsapp-signal-instagram-and-imessage-users/
ADVISORYhttps://github.com/zadewg/RIUS
ADVISORYhttps://blog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-whatsapp-signal-instagram-and-imessage-users/
ADVISORYhttps://github.com/zadewg/RIUS

All References (8)

→
https://blog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-whatsapp-signal-instagram-and-imessage-users/Third Party Advisory
→
https://github.com/sickcodes/security/blob/master/advisories/SICK-2022-42.mdExploit · Patch · Third Party Advisory
→
https://github.com/zadewg/RIUSThird Party Advisory
→
https://sick.codes/sick-2022-42Exploit · Patch · Third Party Advisory
→
https://blog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-whatsapp-signal-instagram-and-imessage-users/Third Party Advisory
→
https://github.com/sickcodes/security/blob/master/advisories/SICK-2022-42.mdExploit · Patch · Third Party Advisory
→
https://github.com/zadewg/RIUSThird Party Advisory
→
https://sick.codes/sick-2022-42Exploit · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2022-28345
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
Affected1 vendor(s)
PublishedApr 15, 2022

Related CVEs (CWE-74)

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CVE-2023-32314
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CVE-2025-20265
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-28345 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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