Firefox Patches 2 Zero Days Exploited

---
title: "Mozilla Secures Firefox: Critical Zero-Day Vulnerabilities Patched at Pwn2Own Berlin"
categories: [Cybersecurity & Data Protection, Vulnerabilities]
date: 2025-05-19
author: "Vitus"
tags: [firefox, cybersecurity, vulnerabilities]
---

## TL;DR
Mozilla recently released critical security updates for Firefox to address two zero-day vulnerabilities exploited at Pwn2Own Berlin. These patches are essential for preventing potential data breaches and code execution risks.

## Main Content

Mozilla has released crucial security updates to address two critical zero-day vulnerabilities in its Firefox browser. These security flaws, if exploited, could allow attackers to access sensitive data or execute malicious code. The vulnerabilities were both demonstrated at the Pwn2Own Berlin event, highlighting the importance of prompt updates.

### Details of the Vulnerabilities

1. **CVE-2025-4918**: This vulnerability involves an out-of-bounds access issue when resolving Promise objects. If exploited, it could lead to unauthorized data access or code execution.
2. **CVE-2025-4919**: This flaw relates to a use-after-free error in the browser's rendering engine, which could be exploited to execute arbitrary code.

Both vulnerabilities were successfully exploited during the Pwn2Own Berlin hacking competition, emphasizing the urgent need for users to update their browsers immediately.

### Importance of Prompt Updates

Security experts advise that users apply these updates as soon as possible to mitigate the risks associated with these vulnerabilities. Keeping software up-to-date is a fundamental practice in maintaining cybersecurity hygiene and protecting against potential threats.

### Conclusion

Mozilla's prompt response to these critical vulnerabilities underscores the importance of continuous monitoring and updating of software. Users are encouraged to stay vigilant and ensure their systems are always protected against the latest threats.

## Additional Resources

For further insights, check:
- [The Hacker News](https://thehackernews.com/2025/05/firefox-patches-2-zero-days-exploited.html)

## References

[^1]: The Hacker News (2025-05-19). "[Firefox Patches 2 Zero-Days Exploited at Pwn2Own Berlin with $100K in Rewards](https://thehackernews.com/2025/05/firefox-patches-2-zero-days-exploited.html)". The Hacker News. Retrieved 2025-05-19.