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A vulnerability in ISM.DLL in Microsoft IIS 4.0 and 5.0 allows remote attackers to read arbitrary file contents. By requesting a file with a large number of encoded spaces (%20) appended and terminating the request with a .htr extension, attackers can bypass normal access controls and retrieve file fragments. This is known as the ".HTR File Fragment Reading" vulnerability.
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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.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
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.
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