What is the CVSS score of CVE-2025-55177?

CVE-2025-55177 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.8%.

Is CVE-2025-55177 being actively exploited?

Yes, CVE-2025-55177 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

How to fix or mitigate CVE-2025-55177?

Within 24 hours: Identify affected systems running WhatsApp for iOS and apply vendor patches immediately. Monitor vendor channels for patch availability.

Whatsapp CVE-2025-55177

MEDIUM

Incorrect Authorization (CWE-863)

2025-08-29 cve-assign@fb.com

Authentication Bypass Apple Whatsapp Whatsapp Business

5.4

CVSS 3.1 · Vendor: fb

View

Vulnerability Assessment

Weakness	CWE CWE-863 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Authorization logic validation MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. CISA has confirmed active exploitation in the wild. EPSS exploitation probability: 0.81%.
Exploit ScenarioDerived	A remote attacker could bypass authorization checks to access restricted resources by sending crafted requests to the affected application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Exploited in the wild (CISA KEV) No patch listed yet 0.8% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

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. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. Actively exploited in the wild (cisa kev) and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Review and test authorization logic, implement consistent access control checks, use centralized authorization framework.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Incorrect Authorization (CWE-863), which allows attackers to bypass authorization checks to access restricted resources. 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. Affected products include: Whatsapp, Whatsapp Whatsapp Business.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (fb) PRIMARY 5.4 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Primary rating from Vendor (fb) · only source for this CVE.

CVSS VectorVendor: fb

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Added to CISA KEV

Oct 24, 2025 - 14:14 cisa

CISA KEV

CVE Published

Aug 29, 2025 - 16:15 nvd

MEDIUM 5.4

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

Organizations using WhatsApp for iOS should be aware of moderate risk from CVE-2025-55177, a incorrect authorization vulnerability rated CVSS 5.4. Attackers could gain access beyond their authorized level. This vulnerability is actively exploited in the wild (KEV-listed). Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: High

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.8%

Top 26% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

CISA KEV

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV Yes

Public POC No

EPSS 0.8%

Patch available No

Active threat Yes

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: +50

EPSS: +1

CVSS: +27

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:*

cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:macos:*:*

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

More in Whatsapp

View all

CVE-2022-36934 CRITICAL Act Now POC

9.8 Sep 22

An integer overflow in WhatsApp could result in remote code execution in an established video call. Rated critical sever

CVE-2019-11932 HIGH This Week POC

8.8 Oct 03

A double free vulnerability in the DDGifSlurp function in decoding.c in the android-gif-drawable library before version

CVE-2022-27492 HIGH This Week POC

7.8 Sep 23

An integer underflow in WhatsApp could have caused remote code execution when receiving a crafted video file. Rated high

CVE-2018-6344 HIGH This Week POC

7.5 Dec 31

A heap corruption in WhatsApp can be caused by a malformed RTP packet being sent after a call is established. Rated high

CVE-2020-1889 CRITICAL Act Now

10.0 Sep 03

A security feature bypass issue in WhatsApp Desktop versions prior to v0.3.4932 could have allowed for sandbox escape in

CVE-2021-24041 CRITICAL Act Now

9.8 Dec 07

A missing bounds check in image blurring code prior to WhatsApp for Android v2.21.22.7 and WhatsApp Business for Android

CVE-2021-24026 CRITICAL Act Now

9.8 Apr 06

A missing bounds check within the audio decoding pipeline for WhatsApp calls in WhatsApp for Android prior to v2.21.3, W

CVE-2020-1909 CRITICAL Act Now

9.8 Nov 03

A use-after-free in a logging library in WhatsApp for iOS prior to v2.20.111 and WhatsApp Business for iOS prior to v2.2

CVE-2020-1907 CRITICAL Act Now

9.8 Oct 06

A stack overflow in WhatsApp for Android prior to v2.20.196.16, WhatsApp Business for Android prior to v2.20.196.12, Wha

CVE-2020-1891 CRITICAL Act Now

9.8 Sep 03

A user controlled parameter used in video call in WhatsApp for Android prior to v2.20.17, WhatsApp Business for Android

CVE-2019-11933 CRITICAL Act Now

9.8 Oct 23

A heap buffer overflow bug in libpl_droidsonroids_gif before 1.2.19, as used in WhatsApp for Android before version 2.19

CVE-2019-3568 CRITICAL Act Now

9.8 May 14

A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTC

Same weakness CWE-863 – Incorrect Authorization

View all

CVE-2025-54253 CRITICAL POC

10.0

CVE-2025-24200 MEDIUM

6.1

CVE-2026-71362 CRITICAL POC

9.1

CVE-2026-42016 HIGH POC

8.8

CVE-2023-21715 HIGH

7.3

CVE-2025-21480 HIGH

8.6

CVE-2025-21479 HIGH

8.6

CVE-2025-32462 HIGH POC

8.8

Same technique Authentication Bypass

View all

CVE-2015-3306 CRITICAL POC

10.0

CVE-2023-22515 CRITICAL POC

9.8

CVE-2012-4681 CRITICAL POC

9.8

CVE-2013-2465 CRITICAL POC

9.8

CVE-2011-3544 CRITICAL POC

9.8

CVE-2022-40684 CRITICAL POC

9.8

CVE-2025-61882 CRITICAL POC

9.8

CVE-2024-0012 CRITICAL POC

9.3

References

Advisories & patches

ADVISORY https://www.facebook.com/security/advisories/cve-2025-55177 ADVISORY https://www.whatsapp.com/security/advisories/2025/ REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55177

Search Externally

GitHub PoC

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