How severe is CVE-2016-6558?

CVE-2016-6558 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-2016-6558 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6558?

CVE-2016-6558 primarily affects Asus Rp-ac52 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6558?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-6558 published?

CVE-2016-6558 was published on 2018-07-13 and last updated on 2026-06-17.

CVE-2016-6558

CVE-2016-6558 is a critical-severity vulnerability in Asus Rp-ac52 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Asus Rp-ac52 Firmware
Published: 2018-07-13
Last modified: 2026-06-17

Description

A command injection vulnerability exists in apply.cgi on the ASUS RP-AC52 access point, firmware version 1.0.1.1s and possibly earlier, web interface specifically in the action_script parameter. The action_script parameter specifies a script to be executed if the action_mode parameter does not contain a valid state. If the input provided by action_script does not match one of the hard coded options, then it will be executed as the argument of either a system() or an eval() call allowing arbitrary commands to be executed.

Frequently asked questions

What is CVE-2016-6558?: A command injection vulnerability exists in apply.cgi on the ASUS RP-AC52 access point, firmware version 1.0.1.1s and possibly earlier, web interface specifically in the action_script parameter. The action_script parameter specifies a script to be executed if the action_mode parameter does not contain a valid state. If the input provided by action_script does not match one of the hard coded options, then it will be executed as the argument of either a system() or an eval() call allowing arbitrary commands to be executed.
How severe is CVE-2016-6558?: CVE-2016-6558 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-2016-6558 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6558?: CVE-2016-6558 primarily affects Asus Rp-ac52 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6558?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2016-6558 published?: CVE-2016-6558 was published on 2018-07-13 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:o:asus:rp-ac52_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:asus:ea-n66_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:asus:rp-n12_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:asus:rp-n14_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:asus:rp-n53_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:asus:rp-ac56_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:asus:wmp-n12_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Asus Rp-ac52 Firmware

CVE-2016-6557 — High (CVSS 8.8): In ASUS RP-AC52 access points with firmware version 1.0.1.1s and possibly earlier, the web interface, the web interface…

All CVEs affecting Asus Rp-ac52 Firmware →

Other CWE-77 (Command Injection) vulnerabilities

CVE-2026-105484 — Critical (CVSS 10.0): A security vulnerability has been detected in TOTOLINK X6000R 9.4.0cu.652_B20230116. The impacted element is the…
CVE-2026-105134 — Critical (CVSS 10.0): A flaw has been found in Ahsay AhsayCBS up to 10.3.2. This vulnerability affects unknown code of the file…
CVE-2026-102240 — Critical (CVSS 10.0): A vulnerability was found in Netcore NAP930 0.1.241010.141410. This affects the function eval of the file…
CVE-2026-101076 — Critical (CVSS 10.0): A vulnerability was detected in Netcore NR289-GE 1.4.5102. This affects the function system of the file…
CVE-2026-101075 — Critical (CVSS 10.0): A security vulnerability has been detected in Netcore NR289-GE 1.4.5102. The impacted element is the function system of…
CVE-2026-101072 — Critical (CVSS 10.0): A vulnerability was identified in Netcore NR289-GE 1.4.5102. This issue affects the function system of the file…

Browse all CWE-77 (Command Injection) vulnerabilities →