CVE-2025-55177: Meta Platforms WhatsApp Incorrect Authorization Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 2 Sep 2025, 4 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 13.1%
EPSS score, percentile 96.3 of all scored records
- How severe?
- 5.4 Medium
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline 23 Sep 2025. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- from 2.22.25.2 to before 2.25.21.78
- from 2.22.25.2 to before 2.25.21.78
- from 2.22.25.2 to before 2.25.21.73
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
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 due date for this action: 23 September 2025.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 2.22.25.2 to before 2.25.21.78 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | from 2.22.25.2 to before 2.25.21.78 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | from 2.22.25.2 to before 2.25.21.73 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Meta Platforms WhatsApp contains an incorrect authorization vulnerability due to an incomplete authorization of linked device synchronization messages. This vulnerability could allow an unrelated user to trigger processing of content from an arbitrary URL on a target’s device.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2025-55177 to its Known Exploited Vulnerabilities (KEV) catalog on 2 Sep 2025.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 23 Sep 2025.
- The CVE record was published on 29 Aug 2025, 4 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 5.4 (Medium), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 13.1% (percentile 96.3), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 29 Aug 2025 | CVE record published |
| 2 Sep 2025 | Added to CISA KEV |
| 23 Sep 2025 | CISA due date for the required action |
| 7 Oct 2026 | CVE record last updated |
References
More exploited Meta vulnerabilities
- CVE-2025-55182: Meta React Server Components Remote Code Execution Vulnerability
- CVE-2019-18426: WhatsApp Cross-Site Scripting Vulnerability
- CVE-2019-3568: WhatsApp VOIP Stack Buffer Overflow Vulnerability