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Palo Alto Networks Researcher Discovers 3 Critical Internet Explorer Vulnerabilities ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) \< 1 min read * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Ryan Olson](https://unit42.paloaltonetworks.com/author/ryan-olson/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:June 9, 2015 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [Internet Explorer](https://unit42.paloaltonetworks.com/tag/internet-explorer/) * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/) * [Microsoft Security Bulletin](https://unit42.paloaltonetworks.com/tag/microsoft-security-bulletin/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/palo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2/?pdf=download&lg=en&_wpnonce=40dbae5d0f "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/palo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2/?pdf=print&lg=en&_wpnonce=40dbae5d0f "Click here to print") Share![Down arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/down-arrow.svg) * ![Link Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-share-link.svg) * [![Link Email](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-sms.svg)](mailto:?subject=Palo%20Alto%20Networks%20Researcher%20Discovers%203%20Critical%20Internet%20Explorer%20Vulnerabilities&body=Check%20out%20this%20article%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fpalo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2%2F "Share in email") * [![Facebook Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-fb-share.svg)](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Funit42.paloaltonetworks.com%2Fpalo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2%2F "Share in Facebook") * [![LinkedIn Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-linkedin-share.svg)](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fpalo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2%2F&title=Palo%20Alto%20Networks%20Researcher%20Discovers%203%20Critical%20Internet%20Explorer%20Vulnerabilities "Share in LinkedIn") * [![Twitter Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-twitter-share.svg)](https://twitter.com/intent/tweet?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fpalo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2%2F&text=Palo%20Alto%20Networks%20Researcher%20Discovers%203%20Critical%20Internet%20Explorer%20Vulnerabilities "Share in Twitter") * [![Reddit Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-reddit-share.svg)](https://www.paloaltonetworks.com//www.reddit.com/submit?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fpalo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2%2F&ts=markdown "Share in Reddit") * [![Mastodon Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=Palo%20Alto%20Networks%20Researcher%20Discovers%203%20Critical%20Internet%20Explorer%20Vulnerabilities%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fpalo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities-2%2F "Share in Mastodon") Palo Alto Networks researcher Bo Qu discovered three new critical Internet Explorer (IE) vulnerabilities affecting IE versions 6, 7, 8, 9, 10 and 11. All three are included in [Microsoft's June 2015 Security Bulletin](https://technet.microsoft.com/en-us/library/security/ms15-jun.aspx), and documented in [Microsoft Security Bulletin MS15-056](https://technet.microsoft.com/library/security/MS15-056). In our continuing commitment to the security research community, these vulnerabilities were disclosed to Microsoft through our participation in the Microsoft Active Protections Program (MAPP) program, which ensures the timely, responsible disclosure of new vulnerabilities and creation of protections from security vendors. Palo Alto Networks is a regular contributor to vulnerability research. Previous critical IE vulnerability discoveries from the past year included [three in May](https://blog.paloaltonetworks.com/2015/05/palo-alto-networks-researcher-discovers-3-critical-internet-explorer-vulnerabilities/), [one in March](https://blog.paloaltonetworks.com/2015/03/palo-alto-networks-researcher-identifies-critical-internet-explorer-vulnerability/), [five in February](https://blog.paloaltonetworks.com/2015/02/palo-alto-networks-researcher-identifies-3-critical-internet-explorer-vulnerabilities/) (revised from three), [three in November 2014](https://blog.paloaltonetworks.com/2014/11/palo-alto-networks-identifies-3-critical-internet-explorer-vulnerabilities/), [one in October 2014](https://blog.paloaltonetworks.com/2014/10/palo-alto-networks-identifies-critical-internet-explorer-vulnerability/), [15 in September 2014](https://blog.paloaltonetworks.com/2014/09/palo-alto-networks-identifies-15-critical-internet-explorer-vulnerabilities/), [three in August 2014](https://blog.paloaltonetworks.com/2014/08/palo-alto-networks-discovers-3-critical-internet-explorer-vulnerabilities/), [10 in July 2014](https://blog.paloaltonetworks.com/2014/07/palo-alto-networks-discovers-additional-10-critical-internet-explorer-vulnerabilities), and [22 in June 2014](https://blog.paloaltonetworks.com/2014/06/palo-alto-networks-identifies-new-critical-vulnerabilities-internet-explorer/) (revised from 21). By proactively identifying these vulnerabilities, developing protections for our customers, and sharing them with Microsoft for patching, we are removing one weapon used by attackers to compromise enterprise and government networks. Back to top ### Tags * [Internet Explorer](https://unit42.paloaltonetworks.com/tag/internet-explorer/ "Internet Explorer") * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/ "Microsoft") * [Microsoft Security Bulletin](https://unit42.paloaltonetworks.com/tag/microsoft-security-bulletin/ "Microsoft Security Bulletin") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: KeyBase Keylogger Malware Family Exposed](https://unit42.paloaltonetworks.com/keybase-keylogger-malware-family-exposed/ "KeyBase Keylogger Malware Family Exposed") ### Related Articles * [How We Added WebAuthn to a Browser-Based RDP Client](https://unit42.paloaltonetworks.com/webauthn-added-to-browser-based-rdp/ "article - table of contents") * [Inside AD CS Escalation: Unpacking Advanced Misuse Techniques and Tools](https://unit42.paloaltonetworks.com/active-directory-certificate-services-exploitation/ "article - table of contents") * [Microsoft WSUS Remote Code Execution (CVE-2025-59287) Actively Exploited in the Wild (Updated November 3)](https://unit42.paloaltonetworks.com/microsoft-cve-2025-59287/ "article - table of contents") ## Related Vulnerabilities Resources ![Pictorial representation of a group of people interacting with a dynamic 3D holographic display of colorful, undulating data waves on a table.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/09/11_Myth-Busting_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/Insights-icon-white.svg)Insights](https://unit42.paloaltonetworks.com/category/insights/) August 4, 2026 [#### The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/) * [AI](https://unit42.paloaltonetworks.com/tag/ai/ "AI") * [Frontier AI](https://unit42.paloaltonetworks.com/tag/frontier-ai/ "Frontier AI") * [Vulnerability Exploitation](https://unit42.paloaltonetworks.com/tag/vulnerability-exploitation/ "Vulnerability Exploitation") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/ "The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software") ![Pictorial representation of AI-enabled autonomous cyberattacks. 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