What is the CVSS score of CVE-2025-55177?

CVE-2025-55177 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.8%.

Which versions of iOS are affected by CVE-2025-55177?

Organizations using WhatsApp for iOS should be aware of moderate risk from CVE-2025-55177, a incorrect authorization vulnerability rated CVSS 5.4.

Is CVE-2025-55177 being actively exploited?

Yes, CVE-2025-55177 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

How to fix or mitigate CVE-2025-55177?

Within 24 hours: Identify affected systems running WhatsApp for iOS and apply vendor patches immediately. Monitor vendor channels for patch availability.

iOS CVE-2025-55177

MEDIUM

Incorrect Authorization (CWE-863)

2025-08-29 cve-assign@fb.com

Authentication Bypass Apple iOS Whatsapp Whatsapp Business

5.4

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:09 vuln.today

Added to CISA KEV

Oct 24, 2025 - 14:14 cisa

CISA KEV

CVE Published

Aug 29, 2025 - 16:15 nvd

MEDIUM 5.4

DescriptionNVD

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.

AnalysisAI

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. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. Actively exploited in the wild (cisa kev) and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Incorrect Authorization (CWE-863), which allows attackers to bypass authorization checks to access restricted resources. 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 products include: Whatsapp, Whatsapp Whatsapp Business.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Review and test authorization logic, implement consistent access control checks, use centralized authorization framework.

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CVE-2025-55177 vulnerability details – vuln.today

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