WhatsApp Zero-Click RCE: Malicious DNG Image Exploits Vulnerability CVE-2025-55177 (CVSS Score N/A)

Estimated reading time: 7 minutes

  • Critical zero-click RCE vulnerability (CVE-2025-55177) discovered in WhatsApp.
  • Attackers can compromise iOS, macOS, and iPadOS devices via a malicious DNG image.
  • Exploit requires no user interaction, making it highly dangerous.
  • Vulnerability lies in WhatsApp’s message handling and DNG image parsing.
  • Immediate action is required: update WhatsApp and install security patches.

Table of contents:

A critical security vulnerability, identified as CVE-2025-55177, has been discovered in WhatsApp, posing a significant risk to millions of Apple users. This zero-click remote code execution (RCE) flaw allows attackers to compromise iOS, macOS, and iPadOS devices by sending a specially crafted DNG image file. This exploit requires no user interaction, making it particularly dangerous. The vulnerability lies in WhatsApp’s handling of messages and its DNG image parsing library.

Understanding the WhatsApp Zero-Click Vulnerability: CVE-2025-55177

The vulnerability, CVE-2025-55177, stems from a logic error in WhatsApp’s message handling. According to research, WhatsApp fails to properly validate whether an incoming message originates from a linked device. This lack of validation allows attackers to craft messages that appear to come from a user’s own trusted account. Once WhatsApp processes this spoofed message, it triggers a second vulnerability, CVE-2025-43300, related to DNG image parsing.

The Attack Chain: How the Zero-Click Exploit Works

The attack unfolds in a series of steps:

  1. Message Spoofing: The attacker exploits CVE-2025-55177 to send a message that appears to originate from the user’s own device. This bypasses initial security filters within WhatsApp.
  2. Malicious DNG Image: The attacker embeds a malformed DNG (Digital Negative) image into the spoofed message. DNG is a common image format, and its complexity makes it susceptible to parsing vulnerabilities.
  3. Memory Corruption: When WhatsApp automatically processes the DNG image, the malformed data causes a memory corruption error, triggering CVE-2025-43300.
  4. Remote Code Execution (RCE): The memory corruption error leads to remote code execution, granting the attacker control over the target device without any user interaction. The entire attack executes silently, leaving no visible signs of compromise.

Impact and Scope

The potential impact of this zero-click RCE is substantial. Successful exploitation allows an attacker to:

  • Intercept messages
  • Steal photos and videos
  • Record calls
  • Install additional malware
  • Gain full control over the compromised device

Because the exploit works across Apple’s ecosystem, it affects iPhones, iPads, and Mac computers, impacting a large user base.

Technical Analysis: DNG Parsing and Memory Corruption

The vulnerability highlights the risks associated with complex file formats and automated file processing. DNG images, like other advanced image formats, contain multiple embedded metadata sections. A single malformed tag within this metadata can disrupt memory management, creating exploitable conditions. Messaging applications, which automatically handle these file types, become prime targets when validation checks are insufficient.

Mitigation and Prevention

WhatsApp and Apple have been notified of these vulnerabilities. Users are advised to take the following steps:

  • Update WhatsApp: Ensure WhatsApp is updated to the latest version.
  • Install Security Patches: Install the newest iOS, macOS, or iPadOS security patches as soon as they are released.

In the interim, users should exercise caution with unsolicited messages or images, even from known contacts.

Practical Takeaways

  • Technical Readers: Investigate message validation processes to ensure origin authenticity. Implement robust checks for DNG image parsing libraries to identify and reject malformed files. Regularly audit and update third-party libraries to patch known vulnerabilities. Utilize memory protection techniques to mitigate the impact of memory corruption errors.
  • Non-Technical Readers: Update WhatsApp and your device’s operating system immediately when updates are available. Be cautious when receiving unexpected files or messages, even from trusted contacts.

Relevance to PurpleOps Services

This WhatsApp vulnerability underscores the critical need for proactive cyber threat intelligence and comprehensive security measures. PurpleOps offers a range of services that can help organizations protect themselves against similar threats:

  • Cyber Threat Intelligence Platform: PurpleOps provides a cyber threat intelligence platform that aggregates and analyzes data from various sources, including the dark web and underground forums, to identify emerging threats and vulnerabilities. This includes real-time ransomware intelligence and monitoring for discussions related to exploits like CVE-2025-55177.
  • Breach Detection: Early breach detection is crucial to mitigating the impact of a successful exploit. PurpleOps’s platform uses advanced analytics to detect anomalous activity that may indicate a compromise, enabling rapid response and containment.
  • Supply-Chain Risk Monitoring: The vulnerability highlights the risks associated with third-party software. PurpleOps offers supply-chain risk monitoring services to assess the security posture of vendors and identify potential vulnerabilities in the software they provide.
  • Dark Web Monitoring Service: By leveraging a dark web monitoring service, organizations can gain insights into threat actors discussing exploits and potential targets, allowing for proactive defense measures.
  • Telegram Threat Monitoring: Monitoring platforms like Telegram for discussions on vulnerabilities and exploits is crucial for understanding threat actor tactics.
  • Underground Forum Intelligence: Threat actors often discuss exploits and vulnerabilities in underground forums. Monitoring these forums provides early warnings of potential attacks.

This WhatsApp zero-click RCE serves as a reminder of the ongoing challenges in securing messaging applications and the importance of staying informed about emerging threats. By leveraging comprehensive cyber threat intelligence and proactive security measures, organizations can reduce their risk of compromise and protect their sensitive data.

PurpleOps offers a wide range of cybersecurity services, including PurpleOps Solutions, red team operations, and supply chain information security, designed to help you identify and mitigate vulnerabilities before they can be exploited.
Contact us today at PurpleOps Solutions to learn more about how we can help protect your organization from cyber threats. You can also visit our platform page: https://www.purple-ops.io/platform/ for more details.

FAQ

Q: What is a zero-click RCE vulnerability?

A: A zero-click RCE vulnerability allows an attacker to execute arbitrary code on a target device without any user interaction.

Q: What is CVE-2025-55177?

A: CVE-2025-55177 is the identifier for a specific zero-click RCE vulnerability found in WhatsApp.

Q: Which devices are affected?

A: The vulnerability affects iPhones, iPads, and Mac computers.

Q: How can I protect myself?

A: Update WhatsApp and install the latest security patches for your operating system.

Q: What is a DNG image?

A: DNG (Digital Negative) is a common image format used for digital photography.