CVE-2025-55177Incomplete 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…
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It affects Facebook WhatsApp Desktop for Mac and 4 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Sep 2, 2025; federal agencies had to remediate by Sep 23, 2025. Treat that date as your deadline.
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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.
- CVSS
- 5.4 MEDIUM (v3.1, CNA)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
- Weakness (CWE)
- CWE-863
- Known exploited
- Added to CISA KEV Sep 2, 2025; federal remediation due Sep 23, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 4.73% (percentile 92)
- Assigned by
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Facebook WhatsApp Desktop for Mac facebook:whatsapp_desktop_for_mac (from the name) | from 2.22.25.2 before 2.25.21.78 | CNA record |
Facebook WhatsApp Business for iOS facebook:whatsapp_business_for_ios (from the name) | from 2.22.25.2 before 2.25.21.78 | CNA record |
Facebook WhatsApp for iOS facebook:whatsapp_for_ios (from the name) | from 2.22.25.2 before 2.25.21.73 | CNA record |
whatsapp whatsapp whatsapp:whatsapp | from 2.22.25.2 before 2.25.21.73; from 2.22.25.2 before 2.25.21.78 | NVD |
whatsapp whatsapp_business whatsapp:whatsapp_business | from 2.22.25.2 before 2.25.21.78 | NVD |
References
- https://www.facebook.com/security/advisories/cve-2025-55177x-refsource-confirm, vendor-advisory
- https://www.whatsapp.com/security/advisories/2025/x-refsource-confirm, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.