# CVE-2025-55177

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.

- Page: https://www.vulneraibility.com/cve/CVE-2025-55177
- CVSS: 5.4
- Known exploited: yes, in CISA KEV since 2025-09-02; CISA due date 2025-09-23
- EPSS: 13.51%
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept (first 2026-04-24)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-08-30)
- Weakness: CWE-863
- Published: 2025-08-29

## Affected versions

- Facebook WhatsApp Business for iOS: affected >= 2.22.25.2 and < 2.25.21.78
- Facebook WhatsApp Desktop for Mac: affected >= 2.22.25.2 and < 2.25.21.78
- Facebook WhatsApp for iOS: affected >= 2.22.25.2 and < 2.25.21.73

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.facebook.com/security/advisories/cve-2025-55177
- [other] https://www.whatsapp.com/security/advisories/2025/
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.