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Fencer Vulns
high 8.8

CVE-2023-39780 kev in the critical feed json

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_rulelis…

published 2023-09-11 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-43480

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2025-06-02
epss
39.5%
EPSS 39.5% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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.

Patch / fix

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

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA SSVC: exploitation active
  4. CISA patch deadline

Known exploited

Added
17 mo ago
Patch by
2025-06-23 (16 mo ago)
Ransomware
Not known
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor, product
ASUS, RT-AX55 Routers
CISA name
ASUS RT-AX55 Routers OS Command Injection Vulnerability

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1078 Valid Accounts exploitation
  • T1133 External Remote Services exploitation
  • T1588 Obtain Capabilities exploitation
  • T1059.004 Unix Shell primary impact
  • T1021.004 SSH secondary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
17 mo ago

Exploit prediction

39.51% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/1/EN.md referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/2/EN.md referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/3/EN.md referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/4/EN.md referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/5/EN.md referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/6/EN.md referenced PoC, tagged "exploit" by a source, unverified
  • greynoise.io https://www.greynoise.io/blog/stealthy-backdoor-campaign-affecting-asus-routers referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • ASUS RT-AX55

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.