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CVE Record

CVE-2026-71990: MSI Radix AXE6600 v781521 Command Injection via TelnetSSH Function

MSI Radix AXE6600 router firmware version v781521 contains a command injection vulnerability in the TelnetSSH function used for SSH configuration that allows remote attackers to execute arbitrary commands on the affected device. Attackers can exploit this vulnerability through the SSH configuration interface to inject malicious commands and obtain root privileges on the underlying system.

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

A flaw in MSI RadiX AXE6600 firmware v781521 may let a remote attacker inject operating-system commands through SSH configuration functionality and gain root control. Successful compromise could expose network traffic, alter router settings, disrupt connectivity, or support further attacks against connected systems.

Executive priority

Treat as an urgent router-security issue. Identify affected devices immediately, reduce management-interface exposure, and obtain MSI’s confirmed remediation. Prioritize internet-reachable or sensitive-network deployments because successful exploitation could provide root-level control and materially affect confidentiality, integrity, and availability.

Technical view

CVE-2026-71990 is a CWE-78 command injection vulnerability in the TelnetSSH function. It is rated CVSS 3.1 9.8: network-accessible, low complexity, requiring neither privileges nor user interaction, with high confidentiality, integrity, and availability impact. The supplied description identifies firmware v781521, although the affected-version metadata separately lists “0.”

Likely exposure

Exposure is limited to MSI RadiX AXE6600 routers running the affected firmware. Risk is greatest where the SSH configuration or management interface is reachable from untrusted networks. The supplied sources do not establish whether default configurations expose this interface or how many devices are affected.

Exploitation context

The vulnerability reportedly enables arbitrary command execution with root privileges through the SSH configuration interface. No CISA KEV listing or other supplied evidence confirms active exploitation. The bundle also provides no public exploit availability, observed attack activity, or exploitation prerequisites beyond the CVSS assessment.

Researcher notes

The evidence supports command injection in TelnetSSH with root impact, but does not provide code-level details, attack telemetry, or a named fixed version. The description names v781521 while structured affected-version data lists “0,” so asset matching should use vendor confirmation rather than relying solely on the version field.

Mitigation direction

  • Inventory MSI RadiX AXE6600 routers and record their installed firmware versions.
  • Restrict router management and SSH configuration access to trusted administrative networks.
  • Check MSI’s support page for confirmed fixed firmware and installation guidance.
  • Apply vendor-approved firmware promptly after validating operational compatibility.
  • Monitor affected routers for unauthorized configuration changes or unexplained service disruption.

Validation and detection

  • Confirm the exact router model and installed firmware through approved administrative methods.
  • Verify management and SSH configuration interfaces are not internet-accessible.
  • Compare installed firmware against MSI’s current security and support guidance.
  • Review administrative logs and configurations for unexpected accounts, settings, or changes.
  • After updating, confirm the installed version and recheck interface exposure.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

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 lookup
description · low confidence lookup

Execution 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 lookup
cve · low confidence lookup

CVE-2026-71990 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
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

Official CVE source material

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.

2CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheck
9.3CVSS 4.0CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheck

Vulnerability scoring details

Base CVSS 4.0 score

9.3Critical
CVSS 4.0 vector shape for CVE-2026-71990Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: 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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MSIRadix AXE66000affected
Weakness

CWE details

CWE-78

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.