Internet Explorer Heap-Based Buffer Overflow Remote Code Execution
CVE-2025-59295 is a heap-based buffer overflow vulnerability in Internet Explorer / the MSHTML rendering engine. The provided content identifies it as a network-reachable flaw in which improper handling of crafted content can corrupt heap memory, leading to out-of-bounds writes in heap-allocated memory. Successful exploitation can allow an unauthorized attacker to execute arbitrary code in the context of the affected Internet Explorer process. The content does not provide the exact vulnerable function or code path, so more specific implementation details are currently not available.
Are you exposed to this one?
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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
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A buffer overflow vulnerability in Windows MSHTML (CVE-2025-59295) that has been targeted by malware posing as proof-of-concept exploits on GitHub.
A high-profile vulnerability for which fake PoC exploits are being distributed on GitHub as part of a malware campaign. The actual technical details of the vulnerability are not described in this content, but it is being used as a lure for malware distribution.
A security flaw for which fake PoC exploits are being distributed to deliver WebRAT malware.
A critical heap-based buffer overflow vulnerability in Internet Explorer, with a CVSS score of 8.8, for which attackers are distributing fake exploit code on GitHub as a lure for malware delivery.
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.