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VulnerabilityPublished Updated

CVE-2025-57639: Tenda AC9 · OS Command Injection

Source CVE Database V5

0

Not known to be exploited · CVSS 6.5 Medium.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.9% chance of exploitation in 30 days – higher than 62% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Sep 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

AI-suggested

Organizations should immediately identify any Tenda AC9 routers in their environment and verify if the vulnerable Samba guest user configuration is enabled. Until an official patch is released, it is recommended to disable Samba USB sharing features or restrict access to the router's management interface to trusted internal networks only. Network segmentation should be enforced to isolate vulnerable devices from critical infrastructure. Monitoring network traffic for unusual command execution patterns or unauthorized Samba access attempts can help detect exploitation attempts. Applying strict input validation and sanitization on user-configurable parameters is essential for the vendor's patch development. Additionally, organizations should consider replacing consumer-grade routers with enterprise-grade devices that receive timely security updates. Regular firmware updates and vendor advisories should be monitored closely for patches addressing this vulnerability.

Description

OS Command injection vulnerability in Tenda AC9 1.0 was discovered to contain a command injection vulnerability via the usb.samba.guest.user parameter in the formSetSambaConf function of the httpd file.

References

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