CVE-2014-4148

CVE-2014-4148 is a remote code execution vulnerability in a Windows kernel-mode driver caused by improper handling of TrueType fonts. An attacker triggers it by getting a user to render a specially crafted document or web page containing a malicious embedded TrueType font, at which point the flaw is reached in kernel context. Successful exploitation allows the attacker to execute arbitrary code with elevated kernel privileges, effectively giving full control of the affected host. Any Microsoft Windows system that renders untrusted fonts is affected; the source data identifies Microsoft Windows broadly but does not specify exact affected version ranges. The flaw was exploited as a zero-day (headlines tie it to the Lamberts toolkit) and fixed in Microsoft's October 2014 security updates; CISA added it to the Known Exploited Vulnerabilities catalog on 2022-05-25, and EPSS puts the 30-day exploitation probability at about 60%, though no public proof-of-concept is known.

What to do: Apply Microsoft's kernel-mode driver (font handling) security updates from the October 2014 update cycle per the vendor's instructions, as CISA's KEV listing makes patching mandatory for federal agencies. Audit Windows hosts, especially ones that open untrusted documents or web content, for missing patches, since CISA KEV inclusion indicates known in-the-wild exploitation and ransomware relevance is unknown. As defense in depth, restrict rendering of untrusted embedded fonts where your tooling supports it, and prioritize patching internet-facing and shared systems.