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CVE-2021-1636 is an elevation-of-privilege vulnerability in Microsoft SQL Server. Attackers reportedly exploited it to gain a foothold in at least one Ukrainian organization running an unpatched SQL Server installation. The vulnerable function, affected versions, and technical exploitation mechanism are not established.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft SQL Server elevation of privilege vulnerability cited as one possible initial compromise vector in activity associated with HermeticWiper.
A specific vulnerability identified as CVE-2021-1636 that was reportedly used as one of the initial access exploits in attacks associated with HermeticWiper intrusions, targeting Microsoft SQL Server.
A known Microsoft SQL Server vulnerability that attackers exploited to gain initial access to a Ukrainian organization prior to deploying HermeticWiper.
A Microsoft SQL Server vulnerability apparently exploited to compromise at least one Ukrainian organization targeted in the disk-wiper campaign. Investigators observed SQL Server-associated execution of whoami on November 11, 2021, followed the next day by a PowerShell command downloading a file from an internal host. The content does not specify the vulnerability's technical root cause.
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.