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CVE-2025-55177VulnerabilityPublished Updated

CVE-2025-55177: Facebook WhatsApp Desktop for Mac · Incorrect Authorization

Affects Facebook WhatsApp Desktop for MacSource CVE Database V5

0

Mentioned vulnerabilities

Exploited in the wild · KEV due 23 Sep 2025 · 13% EPSS : upgrade to 2.25.21.78 now.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.
KEV deadline
 US federal agencies must patch by this date; a sensible deadline for everyone else.
EPSS
13.0% chance of exploitation in 30 days – higher than 96% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.25.21.78, 2.25.21.73
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 29 Aug 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: evidence found.

    Listed in CISA KEV 4 days after disclosure

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by facebook

    , 21 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. In Threat Radar

    record ingested

    , 12 minutes after disclosure

  4. , 4 days after disclosure

  5. KEV remediation due

    US federal deadline

    , 25 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade WhatsApp to 2.25.21.78 (Desktop for Mac, Business for iOS) or 2.25.21.73 (iOS).

Affected software

ProductAffectedFixed in
FacebookWhatsApp Desktop for MacAffected
  • >=2.22.25.2 <2.25.21.78
Fixed in
  • 2.25.21.78
FacebookWhatsApp Business for iOSAffected
  • >=2.22.25.2 <2.25.21.78
Fixed in
  • 2.25.21.78
FacebookWhatsApp for iOSAffected
  • >=2.22.25.2 <2.25.21.73
Fixed in
  • 2.25.21.73

Description

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.

References

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