Windows SMB Server Relay-Based Elevation of Privilege
CVE-2025-55234 is an elevation of privilege vulnerability in the Windows SMB Server. According to the provided content, the issue arises when the SMB Server is susceptible to relay attacks depending on configuration, specifically when key hardening measures such as SMB Server signing and Extended Protection for Authentication (EPA) are not enabled. Multiple sources in the content characterize the flaw as improper authentication handling or insufficient validation of the authentication context during SMB session establishment, allowing an attacker to relay authentication traffic against a target host. Microsoft released this CVE together with audit capabilities to help customers identify compatibility issues before enforcing SMB hardening measures.
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
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository provides a proof-of-concept (PoC) exploit for CVE-2025-55234, a vulnerability in the SMB protocol on Windows systems that allows for relay attacks leading to elevation of privilege. The repository contains a README.md with a detailed explanation of the vulnerability, its impact, and a PowerShell script demonstrating the attack. The script enumerates SMB shares on a specified target IP, captures session information, and executes an SMB relay attack to impersonate users and gain elevated privileges. The exploit is intended for educational and defensive purposes, helping security professionals test and secure their environments. The only code present is in the README.md as a PowerShell snippet; there are no standalone scripts or binaries. The main fingerprintable endpoint is the target IP address (192.168.1.10) used in the example. The exploit is a PoC and not weaponized, requiring manual configuration and execution.
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
25 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A CVE identifier referenced in a fake PoC repository used as a malware delivery lure for SalatStealer; the content gives no details about the actual vulnerability.
A Windows SMB elevation of privilege vulnerability reported as exploited.
A CVE identifier used as a lure label for a malicious GitHub PoC repository associated with Webrat distribution; the article provides no details on the underlying flaw.
An elevation of privilege flaw in Windows SMB server.
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.