CISA KEV · Known exploitedMedium

CVE-2025-55177

Meta Platforms WhatsApp

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
EPSS: 4.21%
CISA KEV: Listed
Published: 2025.08.30

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability4.21%

Technical severityCVSS 5.4

Vulnerability overview

Affected product and versions

Product: Meta Platforms WhatsApp
Affected versions: 2.22.25.2, >= 2.22.25.2 < 2.25.21.73, >= 2.22.25.2 < 2.25.21.78
Fixed versions: 2.25.21.73, 2.25.21.78

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA 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.

Due date: 2025.09.23

1
Identify
Confirm that Meta Platforms WhatsApp and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE: CWE-863
KEV added: 2025.09.02
Ransomware use: 미확인