How severe is CVE-2025-55177?

CVE-2025-55177 has a CVSS 3.1 base score of 5.4 (MEDIUM). EPSS estimates a 4.7% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2025-55177: Meta Platforms WhatsApp Incorrect Authorization

CISA Known Exploited Vulnerabilities

Meta Platforms WhatsApp Incorrect Authorization Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2025-09-02

Remediation due

2025-09-23

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.

CISA notes
https://www.whatsapp.com/security/advisories/2025/ ; https://nvd.nist.gov/vuln/detail/CVE-2025-55177

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.

Severity

CVSS 3.1 · CNA5.4 MEDIUM

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Exploitation Context

as of October 14, 2026

All KEV statistics→

CISA added CVE-2025-55177 to the KEV catalog 4 days after its CVE record was published. The median for entries added in 2025 is 26 days.
It is one of 3 Meta Platforms entries in the CISA KEV catalog, and the only one added in 2025.
Its current EPSS score (4.7%) is higher than that of 17% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Facebook	Facebook WhatsApp Desktop for Mac	2.22.25.2 to <2.25.21.78
Facebook	Facebook WhatsApp Business for iOS	2.22.25.2 to <2.25.21.78
Facebook	Facebook WhatsApp for iOS	2.22.25.2 to <2.25.21.73

References

2 Links

Other references

Record Details

Published

2025-08-29

Last updated

2026-10-07

Assigner (CNA)

facebook

Credited to

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.