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CVE-2024-27459 is a stack-based buffer overflow vulnerability in the OpenVPN interactive service on Windows, affecting OpenVPN 2.6.9 and earlier. The flaw is caused by improper implementation of message size handling during communication between openvpn.exe and openvpnserv.exe. By sending crafted data that triggers incorrect message length processing, an attacker can cause a stack overflow in the service context. The vulnerability can be used for denial of service and, because the affected service runs with higher privileges than the user-level process, may also be leveraged for local privilege escalation. Reporting around the broader OpenVPN vulnerability set indicates this issue can also be chained with other OpenVPN flaws to contribute to remote code execution scenarios.
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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 public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stack overflow vulnerability in OpenVPN caused by improper implementation of message size loading in communication between openvpn.exe and openvpnserv.exe.
A stack overflow vulnerability in OpenVPN on Windows that can lead to denial-of-service and local privilege escalation.
Multiple vulnerabilities in OpenVPN that can be chained for remote code execution and local privilege escalation.
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.