OS Command Injection in ASUS RT-AX55 Routers (CVE-2023-39780)

Historical catalog analysis: CISA added this entry on June 02, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2023-39780 is an OS command injection vulnerability (CWE-78) identified in ASUS RT-AX55 routers. This flaw enables a remote attacker who has already obtained authentication to execute arbitrary operating system commands on the affected device. The source notes that this vulnerability is represented by CVE-2023-41346.

Exposure and applicability

This vulnerability specifically affects organizations and infrastructure owners deploying ASUS RT-AX55 routers. Because the attack vector requires authentication, exposure is highest in environments where administrative credentials have been compromised or where weak credential policies are in place for network hardware. The ability to execute arbitrary commands remotely suggests a high potential for full device compromise if an attacker gains authenticated access.

Remediation priorities

Based on our analysis of the vulnerability’s nature, we recommend the following prioritization for vulnerability management teams:

1. Asset Identification: Immediately audit network inventories to identify all deployed RT-AX55 units.
2. Vendor Mitigation Application: Apply the mitigations provided by ASUS according to their official instructions. This is the primary method for reducing the attack surface.
3. Lifecycle Evaluation: In cases where vendor mitigations are unavailable or cannot be applied, the source suggests discontinuing use of the product as a necessary risk reduction step.
4. Credential Hardening: Since this is an authenticated vulnerability, rotating administrative passwords and implementing multi-factor authentication (where supported) could reduce the likelihood of an attacker gaining the initial access required to exploit the injection flaw.

How to validate remediation

Verification must go beyond confirming a firmware version number. To ensure exposure has been reduced, defenders should focus on the following:

• Configuration Audit: Verify that the specific settings or interfaces targeted by the command injection are restricted or patched according to vendor guidance.
• Access Control Validation: Confirm that administrative access is limited to authorized management networks and that no default credentials remain active.
• Functional Testing: In a controlled environment, security teams should verify that input fields previously susceptible to OS command injection now properly sanitize inputs or reject malformed commands.

Limits and open questions

It remains unknown whether this vulnerability has been utilized in known ransomware campaigns. Furthermore, while CISA has established a remediation deadline of June 23, 2025, for federal agencies, this date serves as a benchmark rather than a mandatory requirement for non-federal organizations.

Residual risk persists if the underlying authentication mechanism is compromised; patching the command injection prevents the execution of arbitrary commands but does not prevent an authenticated attacker from performing other authorized administrative actions. The effectiveness of any mitigation depends on the completeness of the vendor’s patch in addressing all possible injection vectors within the affected software components.

Source and editorial note

CVE-2023-39780: ASUS RT-AX55 Routers OS Command Injection Vulnerability · Source date: June 02, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: June 05, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 13, 2026 at 00:10 UTC.

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