Known exploited vulnerability
CVE-2025-55177
The short answer
CVE-2025-55177 affects Facebook WhatsApp Desktop for Mac and is rated medium (CVSS 5.4). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-09-02: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-863.
Severity
5.4 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Exploited (CISA KEV)
Yes, since Sep 2, 2025
Federal due date Sep 23, 2025
EPSS, next 30 days
14%
Higher than 96% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
WhatsApp Desktop for Mac, WhatsApp Business for iOS, WhatsApp for iOS. NVD's record lists the exact affected versions.
References
- www.facebook.com/security/advisories/cve-2025-55177 Vendor Advisory
- www.whatsapp.com/security/advisories/2025/ Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177 US Government Resource
Questions
Is CVE-2025-55177 being exploited?
Yes. CISA added CVE-2025-55177 to its Known Exploited Vulnerabilities catalog on 2025-09-02, with a federal remediation due date of 2025-09-23.
How do I fix CVE-2025-55177?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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