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Actively exploited

CVE-2023-39780 ASUS RT-AX55 Routers OS Command Injection Vulnerability

ASUS RT-AX55 devices contain an OS command injection vulnerability that could allow a remote, authenticated attacker to execute arbitrary commands. As represented by CVE-2023-41346.

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch urgentlyCybergen assessment
  • CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 2 Jun 2025.
  • Rated High severity (CVSS 8.8, scored by Vendor).
  • It has been in the catalogue for 522 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

What It Is

On ASUS RT-AX55 3.0.0.4.386.51598 devices, authenticated attackers can perform OS command injection via the /start_apply.htm qos_bw_rulelist parameter. NOTE: for the similar "token-generated module" issue, see CVE-2023-41345; for the similar "token-refresh module" issue, see CVE-2023-41346; for the similar "check token module" issue, see CVE-2023-41347; and for the similar "code-authentication module" issue, see CVE-2023-41348.

Affected Versions

ProductVersions
ASUS RT-AX553.0.0.4.386.51598

From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.

From Watch to Action

What To Do Now

  1. 1

    Find it

    Search your asset inventory and external attack surface for ASUS RT-AX55 Routers. Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

    Vulnerability Management
  3. 3

    Hunt for compromise

    If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.

    Incident Response
  4. 4

    Prove it is fixed

    Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.

    Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsRated high, so if it affects devices in your Cyber Essentials scope, the update must be installed within 14 days of the vendor releasing it.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 23 Jun 2025 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

Stay Ahead

More Exploited ASUS Flaws

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CVE-2025-59374ASUS Live Update Embedded Malicious Code VulnerabilityAdded 17 Dec 2025CVE-2021-32030ASUS Routers Improper Authentication VulnerabilityAdded 2 Jun 2025

All 3 exploited ASUS vulnerabilities

Not Sure If You Are Exposed?

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2023-39780
  3. CVE record: CVE-2023-39780
  4. FIRST EPSS
  5. asus.com/networking-iot-servers/wifi-6/all-series/rt-ax55/helpdesk_bios/?model2Name=RT-AX55
  6. asus.com/content/asus-product-security-advisory/
  7. github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/1/EN.md
  8. github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/2/EN.md
  9. github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/3/EN.md
  10. github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/4/EN.md
  11. github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/5/EN.md
  12. github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/6/EN.md