CVE-2025-55177
MediumExploitedPublic exploitIncomplete 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…
Published Aug 29, 2025 · Updated Oct 8, 2026
Key Facts
Patch immediately- CVE-2025-55177 is a medium-severity vulnerability (CVSS 5.4 v3.1) affecting Whatsapp Business, Whatsapp, WhatsApp Business for iOS and 2 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 20, 2025. Public exploit code is available.
- EPSS estimates a 4.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including WhatsApp Business for iOS 2.25.21.78, WhatsApp Desktop for Mac 2.25.21.78, WhatsApp for iOS 2.25.21.73.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
4.7%
Higher than 91.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-55177 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 2, 2025 | Sep 23, 2025 | Not reported |
| Industry KEV feed | Aug 20, 2025 | Sep 23, 2025 | Not reported |
| CIRCL KEV | Sep 2, 2025 | Sep 23, 2025 | Not reported |
| ENISA EUVD | Sep 2, 2025 | n/a | Not reported |
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.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Whatsapp BusinessWhatsapp | See advisory | 2.25.21.78 |
| WhatsappWhatsapp | See advisory | 2.25.21.73 |
| WhatsApp Business for iOS | >= 2.22.25.2 | 2.25.21.78 |
| WhatsApp Desktop for Mac | >= 2.22.25.2 | 2.25.21.78 |
| WhatsApp for iOS | >= 2.22.25.2 | 2.25.21.73 |
Patched Releases
WhatsApp Business for iOS
2.25.21.78
WhatsApp Desktop for Mac
2.25.21.78
WhatsApp for iOS
2.25.21.73
2.25.21.73, 2.25.21.78
Whatsapp Business
2.25.21.78
Timeline
Added to Industry KEV feed
Aug 20, 2025
Publicly disclosed
Aug 29, 2025
Added to CISA KEV
Sep 2, 2025
Added to CIRCL KEV
Sep 2, 2025
Added to ENISA EUVD
Sep 2, 2025
Last updated
Oct 8, 2026
Weakness Type
- CWE-863 Incorrect Authorization
References
- advisoryhttps://github.com/b1n4r1b01/n-days/blob/main/CVE-2025-43300.md
- advisoryhttps://github.com/cisagov/vulnrichment/issues/201
- advisoryhttps://github.com/hunters-sec/CVE-2025-43300
- advisoryhttps://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2025/43xxx/CVE-2025-43300.json
- advisoryhttps://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2025/55xxx/CVE-2025-55177.json
FAQ
Common Questions.
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.
Affected: Whatsapp Business; Whatsapp; WhatsApp Business for iOS versions >= 2.22.25.2, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 20, 2025.
Yes. It was added on Sep 2, 2025 with a federal remediation due date of Sep 23, 2025.
Public exploit code is available.
Fixed versions are available, including WhatsApp Business for iOS 2.25.21.78, WhatsApp Desktop for Mac 2.25.21.78, WhatsApp for iOS 2.25.21.73.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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