How severe is CVE-2025-55177?

CVE-2025-55177 has a CVSS score of 5.4/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2025-55177?

Affected package information for CVE-2025-55177 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2025-55177?

No fixed version has been published for CVE-2025-55177 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2025-55177 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-55177 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-55177?

CVE-2025-55177 has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 74th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2025-55177 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-55177 (Meta Platforms WhatsApp Incorrect Authorization Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-09-02. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-09-23. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2025-55177?

CVE-2025-55177 is classified as CWE-863 (CWE-863). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2025-55177?

CVE-2025-55177 affects whatsapp whatsapp; whatsapp whatsapp business. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2025-55177 published, and has it been updated?

CVE-2025-55177 was published on August 29, 2025 and was last updated on October 24, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2025-55177: Whatsapp CWE-863 (Medium 5.4)

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk74th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

2 products · 3 configurations

Application

whatsappwhatsapp

≥ 2.22.25.2 && < 2.25.21.78

range

Application

whatsapp businesswhatsapp

≥ 2.22.25.2 && < 2.25.21.78

range

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2025-55177 in your stack?

O3 detects CVE-2025-55177 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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