How severe is CVE-2018-14558?

CVE-2018-14558 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-14558 being actively exploited?

Yes. CVE-2018-14558 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-14558?

CVE-2018-14558 primarily affects Tenda Ac7 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-14558?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-14558 have an EU (EUVD) identifier?

Yes. CVE-2018-14558 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-6467. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2018-14558 published?

CVE-2018-14558 was published on 2018-10-30 and last updated on 2026-06-17.

CVE-2018-14558

CVE-2018-14558 is a critical-severity vulnerability in Tenda Ac7 Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2018-6467
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Weakness: CWE-78
Affected product: Tenda Ac7 Firmware
Published: 2018-10-30
Last modified: 2026-06-17

Description

An issue was discovered on Tenda AC7 devices with firmware through V15.03.06.44_CN(AC7), AC9 devices with firmware through V15.03.05.19(6318)_CN(AC9), and AC10 devices with firmware through V15.03.06.23_CN(AC10). A command Injection vulnerability allows attackers to execute arbitrary OS commands via a crafted goform/setUsbUnload request. This occurs because the "formsetUsbUnload" function executes a dosystemCmd function with untrusted input.

Frequently asked questions

What is CVE-2018-14558?: An issue was discovered on Tenda AC7 devices with firmware through V15.03.06.44_CN(AC7), AC9 devices with firmware through V15.03.05.19(6318)_CN(AC9), and AC10 devices with firmware through V15.03.06.23_CN(AC10). A command Injection vulnerability allows attackers to execute arbitrary OS commands via a crafted goform/setUsbUnload request. This occurs because the "formsetUsbUnload" function executes a dosystemCmd function with untrusted input.
How severe is CVE-2018-14558?: CVE-2018-14558 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-14558 being actively exploited?: Yes. CVE-2018-14558 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-14558?: CVE-2018-14558 primarily affects Tenda Ac7 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-14558?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-14558 have an EU (EUVD) identifier?: Yes. CVE-2018-14558 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-6467. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2018-14558 published?: CVE-2018-14558 was published on 2018-10-30 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:tenda:ac7_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tenda:ac9_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tenda:ac10_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac7 Firmware

CVE-2026-51846 — Critical (CVSS 9.8): In Tenda AC7 v15.03.06.44, the wanSpeed parameter of the route /goform/AdvSetMacMtuWan has a stack buffer overflow…
CVE-2026-51845 — Critical (CVSS 9.8): Tenda AC7 v15.03.06.44 contains a stack buffer overflow vulnerability in the /goform/AdvSetMacMtuWan interface via the…
CVE-2026-51844 — Critical (CVSS 9.8): Tenda AC7 v15.03.06.44 contains a stack buffer overflow vulnerability in the /goform/AdvSetMacMtuWan interface via the…
CVE-2026-51843 — Critical (CVSS 9.8): Tenda AC7 v15.03.06.44 contains a stack buffer overflow vulnerability in the /goform/AdvSetMacMtuWan interface via the…
CVE-2025-29135 — Critical (CVSS 9.8): A stack-based buffer overflow vulnerability in Tenda AC7 V15.03.06.44 allows a remote attacker to execute arbitrary…
CVE-2025-29137 — Critical (CVSS 9.8): Tenda AC7 V1.0 V15.03.06.44 found a buffer overflow caused by the timeZone parameter in the form_fast_setting_wifi_set…

All CVEs affecting Tenda Ac7 Firmware →

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-19188 — Critical (CVSS 10.0): A critical OS command injection vulnerability has been identified in the Haiwell IoT Cloud HMI Gateway product. The…
CVE-2026-48362 — Critical (CVSS 10.0): ColdFusion is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')…
CVE-2026-16812 — Critical (CVSS 10.0): VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access…
CVE-2026-6516 — Critical (CVSS 10.0): Zohocorp ManageEngine ADAudit Plus versions before 8606 are affected by Unauthenticated Remote code execution due to…
CVE-2026-46339 — Critical (CVSS 10.0): 9Router is an AI router & token saver. From 0.4.30 until 0.4.37, 9Router's src/proxy.js middleware did not protect…
CVE-2026-59726 — Critical (CVSS 10.0): Ruflo is an agent meta-harness for Claude Code and Codex. Prior to 3.16.3, ruflo's default docker-compose deployment…

Browse all CWE-78 (OS Command Injection) vulnerabilities →