Security readout for executives and security teams
Plain-English summary
This ASUS RT-AX55 router flaw can let a logged-in attacker run operating-system commands on the device. That can mean full control of the router, traffic interception, outages, or persistence. CISA lists it as known exploited, so affected routers should be treated as urgent exposure, not theoretical risk.
Executive priority
Prioritize this for any ASUS RT-AX55 in business or remote-office networks. Known exploitation and router-level command execution create meaningful risk to connectivity, monitoring blind spots, and traffic trust. Patch or isolate affected devices quickly.
Technical view
CVE-2023-39780 is CWE-78 OS command injection in ASUS RT-AX55 firmware 3.0.0.4.386.51598. The vulnerable input is the qos_bw_rulelist parameter on /start_apply.htm. CVSS 3.1 is 8.8: network reachable, low complexity, low privileges required, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Confirmed affected scope in the bundle is ASUS RT-AX55 firmware 3.0.0.4.386.51598. Exposure is most concerning where router administration is reachable from untrusted networks or where weak, reused, or compromised admin credentials exist.
Exploitation context
Active exploitation is supported by CISA KEV listing for CVE-2023-39780. GreyNoise also reports a stealthy backdoor campaign affecting ASUS routers, but the supplied bundle is insufficient to attribute every described activity specifically to this CVE.
Researcher notes
The record names one firmware version and one parameter. Authentication is required, but privilege level is low. The bundle references related ASUS token-module CVEs, which should be tracked separately rather than assumed covered by this analysis.
Mitigation direction
- Inventory ASUS RT-AX55 devices and record firmware versions.
- Check ASUS guidance for fixed firmware or recommended remediation.
- Remove public access to router administration interfaces.
- Require strong, unique administrative credentials and rotate suspected compromised passwords.
- Monitor routers for unexpected accounts, settings, or persistence indicators.
- Replace devices that cannot be updated or trusted after compromise.
Validation and detection
- Confirm whether any RT-AX55 runs firmware 3.0.0.4.386.51598.
- Verify admin interfaces are unreachable from the public internet.
- Review configuration backups for unexpected QoS or administrative changes.
- Check logs for suspicious authenticated management activity.
- Confirm firmware status against ASUS remediation guidance.
- Assess potentially compromised routers before returning them to service.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-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 lookupExecution 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-39780 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
CISA KEV status
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/1/EN.mdCVE reference
- https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/2/EN.mdCVE reference
- https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/3/EN.mdCVE reference
- https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/4/EN.mdCVE reference
- https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/5/EN.mdCVE reference
- https://github.com/D2y6p/CVE/blob/main/asus/CVE-2023-39780/6/EN.mdCVE reference
- https://www.greynoise.io/blog/stealthy-backdoor-campaign-affecting-asus-routersCVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-39780CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.