Retrospective for 2026-09-04, compiled on 27 October 2026. The date identifies the day being analysed; source publication and revision dates are recorded below.
What this advisory changes in your environment
The starting point is CERTFR-2026-AVI-1115, published on 2026-09-04. Its scope includes Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM). Reported consequences are remote code execution, security control bypass, privilege escalation. These statements apply to the advisory’s scope; they do not assign every consequence to every product or CVE.
This case focuses on Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM). Locate that edition in live installations, deployment images and actual dependencies, rather than treating every product from Sonicwall as equivalent.
Products and versions to examine
- Reference
- CERTFR-2026-AVI-1115
- Source first published
- 2026-09-04
- Latest source revision available for this day
- 2026-09-04
- Named components
- Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM)
- CVE identifiers
- CVE-2026-81939, CVE-2026-78328, CVE-2026-78327
| Component | Published condition |
|---|---|
| Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM) | < 4.3.1-R4 |
For Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM), the published condition is “< 4.3.1-R4”. Compare the version actually loaded with that condition within its own release branch. A fix installed on another edition of Sonicwall does not close this case.
Mechanism and prerequisites
Code execution can give an attacker the permissions of the affected process. Check the service account and reachable network destinations. Component isolation can reduce lateral movement opportunities, but does not replace the fix.
The primary record CVE-2026-81939, published by sonicwall, covers Network Security Manager (NSM). The retained revision is dated 2026-09-04. Its scope is presented separately from the integrations and product groupings in CERTFR-2026-AVI-1115.
Choose the appropriate intervention
- Locate Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM) instances, running releases and service owners. Record condition < 4.3.1-R4 in the ticket alongside reference CERTFR-2026-AVI-1115.
- Compare the installed branch with the vendor’s Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM) release notes. Prepare the package for that branch and a dependent-service test, retaining the pre-change state.
- After changing Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM), capture the loaded version again and verify the workflow below. Any exception needs an owner, an exposure-reduction measure and an expiry date.
Verify the fix in a real workflow
Validation scenario to adapt for Sonicwall: For Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM), test an authorised business flow from each zone reaching the service and confirm management restrictions. If a redundant pair exists, verify both nodes and rule persistence after failover during a planned maintenance window. This is a proposed defensive check, not a claim that testing was performed against third-party systems.
Limit of case CERTFR-2026-AVI-1115: this analysis replaces neither vendor prerequisites nor investigation of your logs. Only documented versions are reproduced; no attack date or victim is invented.
Questions specific to this case
Which condition should be checked for Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM)?
Advisory CERTFR-2026-AVI-1115 states: Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM) — < 4.3.1-R4. Check the edition and running release; do not extend the published boundary to branches absent from the advisory.
What is still needed to assess Sonicwall exposure?
For Sonicwall, establish the running version, the path to the component and process permissions. The sources retained for CERTFR-2026-AVI-1115 do not establish every prerequisite or active exploitation.
Sources and related reading
- CERT-FR · CERTFR-2026-AVI-1115
- Vendor and remediation · psirt.global.sonicwall.com
- CVE-2026-81939 · CNA
Practical guide : Software inventory: prepare for end of support
Explore the decision addressed in this case
Complete source advisory inventory
The article table may be an extract. These lists contain every affected-system entry and CVE in the specified advisory revision. They are not an inventory of your assets and do not map every CVE to every product.
Official source · CERTFR-2026-AVI-1115
Advisory revision : · Checked on :
Affected systems · 1
Original French wording is retained to avoid ambiguous translations of version conditions.
- Network Security Manager On-Prem (VMWare, Hyper-V, Azure et KVM) versions antérieures à 4.3.1-R4