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CVE-2021-3626 is a local privilege escalation vulnerability in the Windows version of Canonical Multipass prior to 1.7.0. The issue arises because the localhost TCP control socket did not properly restrict which local processes could connect to it. As a result, any process running on the local system could access the control interface and request host-to-guest mount operations. This exposed privileged functionality to untrusted local callers and allowed misuse of Multipass management capabilities that should have been limited to authorized contexts.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A prior Multipass vulnerability involving the Windows localhost TCP control socket, mentioned only as historical context.
A command injection vulnerability in Hikvision cameras that can grant attackers full root access and device control.
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.