Threats / Tenda / CVE-2018-14558
CVE-2018-14558
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Tenda AC7, AC9, and AC10 Routers vulnerability
Tenda AC7, AC9, and AC10 routers contain a command injection vulnerability in the formsetUsbUnload function that allows unauthenticated attackers to execute arbitrary OS commands through crafted requests.
Verdict
Today item — known-exploited.
A command injection flaw in Tenda routers enables remote code execution via the setUsbUnload endpoint. The vulnerability has been exploited in the wild and carries a high EPSS score of 0.78, indicating significant real-world attack likelihood.
CISA KEV Yes · 2021-11-034EPSS 0.08672 (verify live)5CVSS 9.8 (CISA)3CISA SSVC Exploitation: active · Automatable: yes · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
441 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.08672 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) · Affected: Tenda, AC7, AC9, and AC10 Routers. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-78 OS Command Injection — weakness family: Injection.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 1100 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious goform/setUsbUnload HTTP request containing shell metacharacters to inject OS commands.
Business
Attacker gains unauthenticated remote code execution on the router with device-level privileges.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute commands to establish persistence, exfiltrate network traffic, or pivot to internal systems.
Business
Router becomes a compromised network access point, exposing all connected devices and data to interception or manipulation.
3
Lateral reach — past segmentation narrative 3
Attacker
I modify router configurations or deploy malware to intercept DNS queries or redirect traffic.
Business
Organization loses network integrity and customer trust; potential regulatory compliance violations and incident response costs.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05