CVE-2023-39780

CVE-2023-39780 is a high-severity vulnerability in Asus Rt-ax55 Firmware with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-06-02). The underlying weakness is classified as CWE-78.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• EPSS exploit prediction: 34% (98th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2025-06-02)
• EU (EUVD) id: EUVD-2023-43480
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-06-02)
• Weakness: CWE-78
• Affected product: Asus Rt-ax55 Firmware
• Published: 2023-09-11
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-39780?

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.

How severe is CVE-2023-39780?

CVE-2023-39780 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-39780 being actively exploited?

Yes. CVE-2023-39780 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-06-02, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-39780?

CVE-2023-39780 affects Asus Rt-ax55 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39780?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2023-39780 have an EU (EUVD) identifier?

Yes. CVE-2023-39780 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-43480. It is also flagged as exploited in the EUVD (since 2025-06-02).

When was CVE-2023-39780 published?

CVE-2023-39780 was published on 2023-09-11 and last updated on 2026-06-17.

References

• https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/1/EN.md
• https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/2/EN.md
• https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/3/EN.md
• https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/4/EN.md
• https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/5/EN.md
• https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/6/EN.md
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-39780
• https://www.greynoise.io/blog/stealthy-backdoor-campaign-affecting-asus-routers

Affected products (1)

• cpe:2.3:o:asus:rt-ax55_firmware:3.0.0.4.386.51598:*:*:*:*:*:*:*

More vulnerabilities in Asus Rt-ax55 Firmware

• CVE-2022-26376 — Critical (CVSS 9.8): A memory corruption vulnerability exists in the httpd unescape functionality of Asuswrt prior to 3.0.0.4.386_48706 and…
• CVE-2021-41435 — Critical (CVSS 9.8): A brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U,…
• CVE-2021-43702 — Critical (CVSS 9.0): ASUS RT-A88U 3.0.0.4.386_45898 is vulnerable to Cross Site Scripting (XSS). The ASUS router admin panel does not…
• CVE-2023-41348 — High (CVSS 8.8): ASUS RT-AX55’s authentication-related function has a vulnerability of insufficient filtering of special characters…
• CVE-2023-41347 — High (CVSS 8.8): ASUS RT-AX55’s authentication-related function has a vulnerability of insufficient filtering of special characters…
• CVE-2023-41346 — High (CVSS 8.8): ASUS RT-AX55’s authentication-related function has a vulnerability of insufficient filtering of special characters…

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