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CVE-2021-26411 is a memory corruption vulnerability in Microsoft Internet Explorer that was exploited in the wild to achieve code execution in the browser’s renderer process. The provided content explicitly identifies it as an Internet Explorer memory corruption issue and notes exploit delivery via fetched HTML/JavaScript pages, including malvertising and spear-phishing-linked pages. Observed exploit code was described as similar to publicly available proof-of-concept code, with modifications to obfuscation and payload retrieval. In reported campaigns, successful exploitation was used to execute shellcode and then stage additional malware loaders or follow-on exploits.
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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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
An Internet Explorer memory corruption vulnerability used by the Magnitude exploit kit to achieve shellcode execution in the browser renderer process.
A Microsoft Edge vulnerability used for code execution.
A Microsoft Edge vulnerability used for code execution.
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.