How severe is CVE-2025-55177?

CVE-2025-55177 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-55177 being actively exploited?

Yes. CVE-2025-55177 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-09-02, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-55177?

CVE-2025-55177 primarily affects Whatsapp. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-55177?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2025-55177 have an EU (EUVD) identifier?

Yes. CVE-2025-55177 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26214. It is also flagged as exploited in the EUVD (since 2025-09-02).

When was CVE-2025-55177 published?

CVE-2025-55177 was published on 2025-08-29 and last updated on 2026-10-18.

CVE-2025-55177

CVE-2025-55177 is a medium-severity vulnerability in Whatsapp with a CVSS 3.x base score of 5.4. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-09-02). The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-09-02)
EU (EUVD) id: EUVD-2025-26214
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-09-02)
Weakness: CWE-863
Affected product: Whatsapp
Published: 2025-08-29
Last modified: 2026-10-18

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.

Frequently asked questions

What is CVE-2025-55177?: 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.
How severe is CVE-2025-55177?: CVE-2025-55177 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-55177 being actively exploited?: Yes. CVE-2025-55177 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-09-02, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2025-55177?: CVE-2025-55177 primarily affects Whatsapp. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-55177?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2025-55177 have an EU (EUVD) identifier?: Yes. CVE-2025-55177 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26214. It is also flagged as exploited in the EUVD (since 2025-09-02).
When was CVE-2025-55177 published?: CVE-2025-55177 was published on 2025-08-29 and last updated on 2026-10-18.

References

Affected products (3)

cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:*
cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:macos:*:*
cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:iphone_os:*:*

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