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CVE-2023-36036 is an elevation-of-privilege vulnerability in the Windows Cloud Files Mini Filter Driver (cldflt.sys). Available technical context ties the flaw to the HsmpRpiDecompressBuffer code path, the same area previously implicated in CVE-2021-31969. The patch analysis cited for CVE-2023-36036 indicates Microsoft added an upper bound check limiting the cstmDataSize field to 0x4000, suggesting the vulnerable logic previously allowed an out-of-bounds memory operation during processing of attacker-controlled Cloud Files reparse data. The issue is local in nature and was reported as actively exploited in the wild. Successful exploitation can be used to elevate privileges from a local context to SYSTEM.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows privilege escalation vulnerability used to obtain SYSTEM privileges before credential-harvesting activity.
A local privilege escalation vulnerability that the content says was used by Interlock and ModeloRAT operators.
A previously patched Windows Cloud Files Mini Filter Driver elevation-of-privilege vulnerability referenced as an example of a prior in-the-wild zero-day in the same component family.
A related vulnerability in the same cldflt.sys decompression path (HsmpRpiDecompressBuffer), patched later and described as actively exploited in the wild, apparently involving insufficient bounds checking on cstmDataSize.
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.