5.4

CVE-2025-55177: Meta Platforms WhatsApp Incorrect Authorization Vulnerability

CVSS: 5.4v3.1MediumKEVAnalyzed
Published 29-08-2025Last modified 07-10-2026
Open JSON

Vulnerability summary

CVE-2025-55177 is a medium (CVSS 5.4) Incorrect Authorization vulnerability in Meta Platforms WhatsApp. It is known to be exploited: CISA lists it, first on 02-09-2025. EPSS estimates a 4.73% chance of exploitation in the next 30 days, higher than 91.7% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
4.73%
0%100%
Low · +0.43 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-08-2025
    PublishedVulnerability first disclosed.
  2. 02-09-2025
    Added to CISA KEVMeta Platforms WhatsApp Incorrect Authorization Vulnerability
  3. 23-09-2025
    CISA remediation dueApply mitigations per vendor instructions.
  4. 07-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

4.73%

Chance of exploitation in the next 30 days

Percentile

92%

Versus all other CVEs

30-day change

+0.43 pp

From 4.30% on 20-09-2026

20-09-202620-10-2026
EPSS score
4.73%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
02-09-2025
Federal due date
23-09-2025

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. www.whatsapp.com/security/advisories/2025/ nvd.nist.gov/vuln/detail/CVE-2025-55177

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Facebook3 products
Whatsapp2 products

2 vendors · 5 products

References

3 links