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CVE-2021-26411 is a memory corruption vulnerability in Microsoft Internet Explorer that can be triggered when a user views a specially crafted website. The flaw affects the browser’s handling of web content and has been exploited in the wild through exploit kits, malvertising chains, and targeted intrusion activity. Available reporting indicates successful exploitation can achieve shellcode execution within the browser’s renderer process, after which attackers may download and execute additional payloads or chain the bug with a local privilege-escalation vulnerability to escape browser constraints and fully compromise the host.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Internet Explorer vulnerability also used in ransomware attacks in the described campaign context.
A remote code execution exploit delivered via a malicious HTML page linked from spear-phishing documents, used to execute/fetch the next-stage loader in the MATA infection chain.
A previously weaponized vulnerability mentioned only as an example of Magnitude's tendency to reuse vulnerabilities first seen in targeted attacks.
A memory corruption vulnerability in Internet Explorer that can be triggered by viewing a specially crafted website.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.