---
id: CVE-2025-55177
title: >-
  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
  processi…
summary: >-
  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
  processi…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-863
vendor: whatsapp
product: whatsapp
affected:
  - 'whatsapp >= 2.22.25.2, < 2.25.21.73'
  - 'whatsapp >= 2.22.25.2, < 2.25.21.78'
  - 'whatsapp_business >= 2.22.25.2, < 2.25.21.78'
patched:
  - whatsapp 2.25.21.78
  - whatsapp_business 2.25.21.78
published: '2025-08-29'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T18:17:14.113'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-55177'
references:
  - url: 'https://www.facebook.com/security/advisories/cve-2025-55177'
    label: cve-assign@fb.com
  - url: 'https://www.whatsapp.com/security/advisories/2025/'
    label: cve-assign@fb.com
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - in-the-wild
  - exploit-available
  - kev
exploited: true
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-08-30T03:55:35.684164Z'
epss: 0.04734
epssPercentile: 0.91613
kev: true
kevDateAdded: '2025-09-02'
kevDueDate: '2025-09-23'
kevRansomware: false
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/danielw98/zero-click-exploit-analysis'
  checkedAt: '2026-10-07T18:42:55.484Z'
ingestedAt: '2026-10-07T18:42:20.877Z'
---

## Overview

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.

## Affected

- `whatsapp >= 2.22.25.2, < 2.25.21.73`
- `whatsapp >= 2.22.25.2, < 2.25.21.78`
- `whatsapp_business >= 2.22.25.2, < 2.25.21.78`

## Remediation

Upgrade past the affected range:

- `whatsapp 2.25.21.78`
- `whatsapp_business 2.25.21.78`