What is CVE-2025-33073?
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.
The record classifies CVE-2025-33073 under weakness class CWE-284. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 10 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 505 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C - EPSS (FIRST)
- 82.6% probability of exploitation in the next 30 days, higher than 99.6% of all scored CVEs
- CISA KEV
- Listed since 2025-10-20, federal remediation deadline 2025-11-10 — used in known ransomware campaigns
- Threadlinqs priority
- 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- Published
- 2025-06-10, last modified 2026-02-26
Is CVE-2025-33073 being exploited?
CISA added CVE-2025-33073 to the Known Exploited Vulnerabilities catalog on 2025-10-20, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-11-10 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2025-33073 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 58 in the Threadlinqs vulnerability feed.
- mverschu/CVE-2025-33073 (github)
- uziii2208/CVE-2025-33073 (github)
- SFRDevelopment/windows-smb-vulnerability-framework-cve-2025-33073 (github)
- EgCupCake/cupntlm-Automated-Exploit-For-CVE-2025-33073- (github)
- obscura-cert/CVE-2025-33073 (github)
- starscow/CVE-2025-33073 (github)
- matejsmycka/CVE-2025-33073-checker (github)
- cve-2025-33073/cve-2025-33073 (github)
Affected products and versions
- Microsoft: Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows Server 2008 R2 Service Pack 1
How to fix CVE-2025-33073
Because CVE-2025-33073 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-11-10. No vendor patch reference has been recorded for CVE-2025-33073 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2025-33073
9 tracked threats in the Threadlinqs corpus reference CVE-2025-33073, either in the campaign’s CVE list or as an indicator on the campaign record.
- Ransomware Surge in Q3 2026: The Gentlemen Overtakes Qilin as Rival Gangs Compete for Market Share — HIGH · 2026-10-24
- Gentlemen Ransomware (Storm-2697): Double-Extortion RaaS with Fortinet Exploitation, BYOVD EDR Killers and GPO-Based Mass Deployment — HIGH · 2026-10-17
- Healthcare Sector Ransomware Targeting and Expanding Attack Surface (Qilin, Akira, DragonForce, LockBit, The Gentlemen) — HIGH · 2026-10-09
- Rehub: Russian-Language Ransomware-as-a-Service Marketplace Absorbing RAMP's Displaced Operators — MEDIUM · 2026-09-16
- The Gentlemen RaaS overtakes Qilin as #1 ransomware operation, wields GentleKiller EDR-killer framework (400+ processes, 8 BYOVD variants) and 90% affiliate payouts — HIGH · 2026-07-14
- The Gentlemen Ransomware: Worm-Like Self-Propagation and Network-Wide Encryption via Storm-2697's RaaS Affiliate Program — CRITICAL · 2026-07-06
- Q1 2026 Ransomware Landscape: Qilin Dominance, LockBit 5.0 Comeback, and FortiGate (CVE-2024-55591) / Oracle EBS (CVE-2025-61882) Mass Exploitation — CRITICAL · 2026-06-10
- Multi-Stage Linux Intrusion via End-of-Life F5 BIG-IP and Unpatched Confluence — SSH Foothold to NTLM Relay (CVE-2025-33073, CVE-2025-53521) — HIGH · 2026-05-26
- F5 BIG-IP Edge Appliance Abused for SSH Pivot → Confluence RCE → CVE-2025-33073 Kerberos Relay to Active Directory (Microsoft Defender Research) — HIGH · 2026-05-23
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .