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CVE-2021-26411 is a memory corruption vulnerability affecting Internet Explorer, including versions 9 and 11, and legacy EdgeHTML-based Microsoft Edge. Rendering a specially crafted webpage can trigger the vulnerability and permit attacker-controlled code execution. Observed exploitation achieved shellcode execution within the Internet Explorer renderer process. The vulnerability was exploited as a zero-day against security researchers and subsequently incorporated into multiple exploit kits and malware campaigns. Microsoft fixed it in March 2021. The specific vulnerable function and memory corruption mechanism are not established by the available information.
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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.
17 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 vulnerability exploited through remote pages linked from spear-phishing documents during the MATA campaign targeting Eastern European oil, gas, and defense corporations.
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.
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.