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CVE-2021-33771 is an elevation-of-privilege vulnerability in the Windows NT operating system kernel. A race condition causes a kernel object to be used after it has been freed. Successful exploitation enables privilege escalation, including browser sandbox escape and kernel code execution. Candiru, tracked by Microsoft as SOURGUM, exploited the vulnerability in browser-and-Windows exploit chains used to deploy DevilsTongue spyware before Microsoft patched it in July 2021.
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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.
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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.
8 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 Microsoft Windows privilege-escalation vulnerability linked in the content to Candiru's DevilsTongue spyware operations and commercial exploitation of zero-days.
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.
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.