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Exploited vulnerability · CISA KEV

Is CVE-2018-14558 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Tenda AC7, AC9, and AC10 Routers · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2018-14558, Tenda AC7, AC9, and AC10 Routers Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 1100 days after it was published. It affects Tenda AC7, AC9, and AC10 Routers. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

Tenda AC7, AC9, and AC10 devices contain a command injection vulnerability due to the "formsetUsbUnload" function executes a dosystemCmd function with untrusted input. Successful exploitation allows an attacker to execute OS commands via a crafted goform/setUsbUnload request.

VendorTenda (3 exploited CVEs in KEV)
ProductAC7, AC9, and AC10 Routers
VulnerabilityTenda AC7, AC9, and AC10 Routers Command Injection Vulnerability
WeaknessCWE-78
Published30 Oct 2018
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for AC7, AC9, and AC10 Routers in your asset inventory, including appliances and cloud images. Stack check lists every exploited Tenda CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 30 Oct 2018.
  4. Get told next time. Email alerts when CISA adds a CVE for Tenda.

References

Questions

Is CVE-2018-14558 being exploited?

Yes. CISA added CVE-2018-14558 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2018-14558 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2018-14558?

Apply updates per vendor instructions. Check Tenda's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected AC7, AC9, and AC10 Routers and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Tenda scorecard · act-now radar.

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