CASCACascade Atlas

Evidence dossier

CVE-2025-55177

CVE-2025-55177

57.6–72.6Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Aug 29, 2025
Updated
Feb 26, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS4.12%

2026-07-18 · v2026.06.15 · percentile 89.6%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

facebookoriginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

Meta Platforms WhatsApp Incorrect Authorization Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.041160000000; percentile 0.896480000000

Applicability

Cited product scope

Trace impact →
FacebookWhatsApp Business for iOS
[{"status": "affected", "version": "2.22.25.2", "lessThan": "2.25.21.78", "versionType": "semver"}]unknown
FacebookWhatsApp Desktop for Mac
[{"status": "affected", "version": "2.22.25.2", "lessThan": "2.25.21.78", "versionType": "semver"}]unknown
FacebookWhatsApp for iOS
[{"status": "affected", "version": "2.22.25.2", "lessThan": "2.25.21.73", "versionType": "semver"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:iphone_os:*:*; start including 2.22.25.2; end excluding 2.25.21.78supported
Unknown vendorUnknown product
cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:*; start including 2.22.25.2; end excluding 2.25.21.73supported
Unknown vendorUnknown product
cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:macos:*:*; start including 2.22.25.2; end excluding 2.25.21.78supported

Assessments

CVSS by origin

5.4
cve-assign@fb.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
5.4
facebookCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.