Broadcom VMWare ESX Insufficient Logging Vulnerability
VMware ESX contains an insufficient logging vulnerability. A malicious administrator could exploit this issue to perform certain operations without them being logged.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 2 / 5
- KEV catalog (CISA)28 Oct 2026
- Exploited in EUVD (ENISA)28 Oct 2026
- Used by ransomwareno
- EPSS above 10 %0.69%
- No account, over the networkno
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
- 9.1.x.x
- 5.x <5.2.4
- 9.0.x.x
- 9.1.x.x <ESXi-9.1.0.0-25370933
- 9.0.x.x <ESXi-9.0.2.0100-25595025
- 5.1.x
- 8.0 <ESXi80U3j-25429389
- 5.0.x
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
-
Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
-
CISA remediation due date
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-59310Broadcom VMware vCenter Path Traversal Vulnerability6.4 · Actively exploited
- CVE-2026-22719Broadcom VMware Aria Operations Command Injection Vulnerability6.2 · Background exploitation
- CVE-2024-37079Broadcom VMware vCenter Server Out-of-bounds Write Vulnerability7.0 · Background exploitation
- CVE-2025-41244Broadcom VMware Aria Operations and VMware Tools Privilege Defined with Unsafe Actions Vulnerability4.6 · Background exploitation
- CVE-2025-1976Broadcom Brocade Fabric OS Code Injection Vulnerability4.7 · Background exploitation