CVE-2025-55177

Name: CVE-2025-55177
Creator: NVD / NIST
Published: 2025-08-29T16:15:36.723+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10Actively ExploitedEPSS 4.12%

Last modified Jun 17, 2026

CVE-2025-55177 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 4.12% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

4.12%

89.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Sep 23, 2025.

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Whatsapp	Whatsapp	>= 2.22.25.2, < 2.25.21.73
Whatsapp	Whatsapp	>= 2.22.25.2, < 2.25.21.78
Whatsapp	Whatsapp Business	>= 2.22.25.2, < 2.25.21.78

References

https://www.facebook.com/security/advisories/cve-2025-55177Vendor Advisory
https://www.whatsapp.com/security/advisories/2025/Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177US Government Resource

Timeline

Published: Aug 29, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-55177?

How severe is CVE-2025-55177?

CVE-2025-55177 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 4.12% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2025-55177?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-55177?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST