Page generated: 11 Nov 2026, 12:59 UTC
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CVE-2025-55177

Incomplete authorization of linked device synchronization messages in WhatsApp for iOS prior to v2.25.21.73, WhatsApp Business for iOS v2.25.21.78, and WhatsApp for Mac v2.25.21.78 could have allowed an unrelated user to trigger processing of content from an arbitrary URL on a ta…

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Incomplete authorization of linked device synchronization messages in WhatsApp for iOS prior to v2.25.21.73, WhatsApp Business for iOS v2.25.21.78, and WhatsApp for Mac v2.25.21.78 could have allowed an unrelated user to trigger processing of content from an arbitrary URL on a target’s device. We assess that this vulnerability, in combination with an OS-level vulnerability on Apple platforms (CVE-2025-43300), may have been exploited in a sophisticated attack against specific targeted users.
CVSS 5.4 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
7.9/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 5.4: +0.81
  • Fresh EPSS: 13.51%: +0.07

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 21 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

CyberSecurityNews
Press · 01 Jan 2026, 08:00 · Top 10 High-Risk Vulnerabilities Of 2026 that Exploited in the Wild - CyberSecurityNews
The Hacker News
Press · 25 Nov 2025, 08:00 · CISA Warns of Active Spyware Campaigns Hijacking High-Value Signal and WhatsApp Users - The Hacker News
Recorded Future
Press · 17 Oct 2025, 07:00 · September 2025 CVE Landscape - Recorded Future
Security Affairs
Press · 17 Sep 2025, 07:00 · Apple backports fix for actively exploited CVE-2025-43300 - Security Affairs
The Hacker News
Press · 16 Sep 2025, 07:00 · Apple Backports Fix for CVE-2025-43300 Exploited in Sophisticated Spyware Attack - The Hacker News
See all 21 source documents
Krebs on Security
Press · 09 Sep 2025, 07:00 · Microsoft Patch Tuesday, September 2025 Edition - Krebs on Security
Lookout
Press · 09 Sep 2025, 07:00 · A vulnerability in WhatsApp for iOS and Mac | Threat Intel - Lookout
CyberSecurityNews
Press · 03 Sep 2025, 07:00 · CISA Warns of WhatsApp 0-Day Vulnerability Exploited in Attacks - CyberSecurityNews
Field Effect
Press · 03 Sep 2025, 07:00 · WhatsApp vulnerability exploited in targeted zero-click attacks - Field Effect
The Hacker News
Press · 03 Sep 2025, 07:00 · CISA Adds TP-Link and WhatsApp Flaws to KEV Catalog Amid Active Exploitation - The Hacker News
Dark Reading
Press · 03 Sep 2025, 07:00 · WhatsApp Bug Anchors Targeted Zero-Click iPhone Attacks - Dark Reading
SOC Prime
Press · 02 Sep 2025, 07:00 · CVE-2025-55177: Vulnerability in WhatsApp iOS & macOS Messaging Clients Exploited for Zero-Click Attacks - SOC Prime
SOCRadar
Press · 01 Sep 2025, 07:00 · CVE-2025-55177: Zero-Click WhatsApp Exploit Leveraged in Targeted Spyware Attacks on Apple Devices - SOCRadar
Hong Kong Computer Emergency Response Team Coordination Centre
Press · 01 Sep 2025, 07:00 · WhatsApp Security Restriction Bypass Vulnerability - Hong Kong Computer Emergency Response Team Coordination Centre
Bitdefender
Press · 01 Sep 2025, 07:00 · Hackers Exploit WhatsApp Security Flaw in ‘Sophisticated’ Attacks. Patch Now! - Bitdefender
Infosecurity Magazine
Press · 01 Sep 2025, 07:00 · WhatsApp Patches Zero-Day, Zero-Click Flaw - Infosecurity Magazine
Rescana
Press · 31 Aug 2025, 07:00 · WhatsApp Zero-Click Exploit: Emergency Update for iOS and macOS (CVE-2025-55177) - Rescana
The Hacker News
Press · 30 Aug 2025, 07:00 · WhatsApp Patches Zero-Click Exploit Targeting iOS and macOS Devices - The Hacker News
heise online
Press · 30 Aug 2025, 07:00 · Zero-click attack on Apple devices via WhatsApp - heise online
BleepingComputer
Press · 29 Aug 2025, 07:00 · WhatsApp patches vulnerability exploited in zero-day attacks - BleepingComputer
Security Affairs
Press · 29 Aug 2025, 07:00 · New zero-click exploit allegedly used to hack WhatsApp users - Security Affairs

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 7.9 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 5.4; EPSS 13.5%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, low privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:59:41.296531+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
29 Aug 2025, 07:00
Published
29 Aug 2025, 15:50
Added to the CISA KEV catalog
02 Sep 2025, 00:00
Latest press mention
01 Jan 2026, 08:00
Score calculated
05 Nov 2026, 13:59