Win32kfull Out-of-Bounds Write Local Privilege Escalation
CVE-2025-62458 is a local elevation-of-privilege vulnerability in Microsoft Windows Win32K / GRFX, specifically within the win32kfull kernel driver. The flaw is described as a heap-based buffer overflow / out-of-bounds write caused by insufficient validation of user-supplied data, resulting in a write past the end of an allocated array. An attacker who can already execute low-privileged code on the target can exploit the flaw to corrupt kernel memory and elevate privileges. Public reporting also states that successful exploitation can lead to arbitrary code execution in the context of SYSTEM.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local privilege escalation vulnerability in Win32k due to a heap-based buffer overflow. Exploitation is considered more likely.
A vulnerability in Win32k, details unspecified but likely privilege escalation or code execution.
Win32k local elevation of privilege vulnerability (noted as more likely to be exploited).
A vulnerability in Windows Win32K flagged as more likely to be exploited.
The version that knows your environment.
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.