Loading vulnerability…
CVE-2021-33771 is a Windows kernel elevation of privilege vulnerability caused by a race condition in the Windows NT-based operating system kernel (NTOS) that results in a use-after-free of a kernel object. The flaw was exploited in the wild as part of an exploit chain used to compromise Windows systems. Microsoft identified it during investigation of Candiru/SOURGUM activity. Successful exploitation enables an attacker to transition from a constrained execution context into kernel-level execution, including escaping browser sandboxes.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows privilege escalation vulnerability discovered during analysis of Candiru spyware and explicitly described as exploited by Candiru.
A Windows zero-day vulnerability used by Candiru as part of an exploit chain to support delivery of DevilsTongue, enabling privilege escalation and helping attackers escape browser sandboxes to gain kernel code execution.
A Windows zero-day vulnerability used by Candiru to infect Windows systems and patched by Microsoft in July 2021.
Windows Kernel elevation of privilege vulnerability observed exploited in attacks before patches were released.
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.