Security readout for executives and security teams
Plain-English summary
CVE-2026-71993 is a critical command injection issue in MSI Radix AXE6600 router firmware v781521. A remote attacker could run commands on the router and gain root-level control. Compromised routers can expose traffic, credentials, and internal network access.
Executive priority
Treat as urgent for any deployed MSI Radix AXE6600 router. A successful attack could give an unauthenticated remote actor full control of the device. Prioritize inventory, exposure reduction, and firmware remediation through MSI guidance.
Technical view
The vulnerability is CWE-78 command injection in the MSI Radix AXE6600 openvpn function, with the advisory describing abuse through macfilter input. CVSS 3.1 is 9.8: network exploitable, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Organizations or homes using MSI Radix AXE6600 routers on firmware v781521 are the stated affected population. Exposure is highest where router administration or vulnerable functionality is reachable by untrusted networks. The provided metadata does not clearly enumerate all affected firmware versions.
Exploitation context
No CISA KEV listing is provided, and the source bundle does not cite active exploitation. The issue is still high urgency because it is remotely exploitable without authentication and can lead to root command execution on a network edge device.
Researcher notes
Evidence is limited to the CVE record and VulnCheck advisory references. The affected version metadata is imprecise, while the description specifically names firmware v781521. Do not assume broader MSI router impact without vendor confirmation.
Mitigation direction
- Identify MSI Radix AXE6600 devices and record firmware versions.
- Check MSI support for updated firmware or vendor remediation guidance.
- Apply the vendor-provided fixed firmware when available and approved.
- Limit router management access to trusted networks only.
- Monitor affected routers for unexpected configuration changes or instability.
Validation and detection
- Confirm whether deployed devices are MSI Radix AXE6600.
- Compare installed firmware against v781521 and MSI support guidance.
- Review exposure of router administration and related VPN features.
- Check logs for unusual administrative actions or configuration changes.
- Track CVE and vendor pages for corrected version details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-71993 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- MSI Vendor SiteCVE reference, VulnCheck · product
- Fix Version DownloadCVE reference, VulnCheck · patch
- https://www.vulncheck.com/advisories/msi-radix-axe6600-v781521-command-injection-via-openvpn-functionCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.