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High

OS Command Injection in ASUS RT-AX55 check token module

IdentifiersCVE-2023-41347CWE-78· Improper Neutralization of Special…

CVE-2023-41347 is an authenticated OS command injection vulnerability in the ASUS RT-AX55 router. According to the provided content, the issue exists in an authentication-related function due to insufficient filtering of special characters in the check token module. An authenticated remote attacker can supply crafted input containing shell metacharacters that is not properly sanitized before being used by the underlying system, resulting in command injection. Successful exploitation allows arbitrary command execution on the device and can be used to disrupt router operation or terminate services.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an authenticated remote attacker to execute arbitrary operating system commands on the affected router. This can lead to full compromise of the device’s management context, service disruption, termination of critical processes, modification of configuration, installation of persistence mechanisms such as backdoors, and use of the router as a relay/proxy node or other malicious infrastructure. The provided content also indicates the vulnerability has been leveraged in large-scale campaigns against outdated ASUS routers.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by disabling remote access features, especially AiCloud where enabled, restricting administrative access to trusted networks only, and preventing router management interfaces from being reachable from the internet. Monitor for unusual traffic, unexpected SSH access, service instability, or signs of persistence such as unauthorized certificates or backdoor accounts. For unsupported devices, replacement is the preferred mitigation.

Remediation

Patch, then assume compromise.

Apply the vendor-provided firmware update from ASUS that addresses CVE-2023-41347. If the affected RT-AX55 device is end-of-life or no patched firmware is available, replace it with a supported model receiving security updates. Ensure all related ASUS WRT firmware updates are fully applied and verify that exposed management and remote-access features are reviewed after upgrade.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
ASUSRt-Ax55 Firmwareoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

5 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware1

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2023-41347
NVD
nvd.nist.gov/vuln/detail/CVE-2023-41347
MITRE CWE · CWE-78
Improper Neutralization of Special Elements…
Third Party Advisory
twcert.org.tw/tw/cp-132-7498-18012-1.html