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Vulnerabilities/CVE-2025-55177Public Intelligence Dossier
Source: whatsapp · Limited verification•Last verified: •Collection Degraded
CVE-2025-55177ListedMEDIUM (raw)CVSS 5.4CWE-863

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

Published: 29 Aug 2025•Last updated: 19 Oct 2026, 02:40 AM IST•Source identifier: cve-assign@fb.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
No KEV match recorded. Absence is not proof of safety.
CVSS score
5.4MEDIUM (raw)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Metric sourcecve-assign@fb.com
EPSS probability
—
Percentile—
Weakness type
CWE-863
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

Critical

Actively exploited

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal

Affected Products & Remediation

2 source-backed products
Affected products and versions (source)
  • whatsapp whatsapp · >= 2.22.25.2 < 2.25.21.73; >= 2.22.25.2 < 2.25.21.78; business >= 2.22.25.2 < 2.25.21.78 · NVD CPE · Source
  • whatsapp whatsapp business · >= 2.22.25.2 < 2.25.21.78 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed); authorization-bypass (CWE-863)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure
  2. Locate affected authorization controls and verify deployed versions.Telemetry: Application inventory · The source must identify the affected control. · Rule authorization-bypass

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure
Show more (2)

Exploitation evidence

  1. Review privileged operations performed by unexpected users on affected deployments.Telemetry: Application audit logs · Authorization anomalies can support a targeted hunt. · Rule authorization-bypass

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

No CISA KEV match is currently recorded. Absence from KEV does not mean a vulnerability is not exploitable.

Change History & Source Data

— No recorded material change

CNA / source
cve-assign@fb.com
Record status · verification
NEW · NVD API
CPE
cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:*, cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:macos:*:*, cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:iphone_os:*:*

Evidence & Provenance

3 public sources
facebook.comSource recordnvd.nist.govSource recordwhatsapp.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-55177
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-55177
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-55177"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library
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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.