How severe is CVE-2020-11966?

CVE-2020-11966 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-2020-11966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-11966?

CVE-2020-11966 affects Evenroute Iqrouter Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-11966?

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-2020-11966 published?

CVE-2020-11966 was published on 2020-04-21 and last updated on 2026-06-17.

CVE-2020-11966

CVE-2020-11966 is a critical-severity vulnerability in Evenroute Iqrouter 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-521.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-521
Affected product: Evenroute Iqrouter Firmware
Published: 2020-04-21
Last modified: 2026-06-17

Description

In IQrouter through 3.3.1, the Lua function reset_password in the web-panel allows remote attackers to change the root password arbitrarily. Note: The vendor claims that this vulnerability can only occur on a brand-new network that, after initiating the forced initial configuration (which has a required step for setting a secure password on the system), makes this CVE invalid. This vulnerability is “true for any unconfigured release of OpenWRT, and true of many other new Linux distros prior to being configured for the first time”

Frequently asked questions

What is CVE-2020-11966?: In IQrouter through 3.3.1, the Lua function reset_password in the web-panel allows remote attackers to change the root password arbitrarily. Note: The vendor claims that this vulnerability can only occur on a brand-new network that, after initiating the forced initial configuration (which has a required step for setting a secure password on the system), makes this CVE invalid. This vulnerability is “true for any unconfigured release of OpenWRT, and true of many other new Linux distros prior to being configured for the first time”
How severe is CVE-2020-11966?: CVE-2020-11966 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-2020-11966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-11966?: CVE-2020-11966 affects Evenroute Iqrouter Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-11966?: 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-2020-11966 published?: CVE-2020-11966 was published on 2020-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:evenroute:iqrouter_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Evenroute Iqrouter Firmware

CVE-2020-11967 — Critical (CVSS 9.8): In IQrouter through 3.3.1, remote attackers can control the device (restart network, reboot, upgrade, reset) because of…
CVE-2020-11965 — Critical (CVSS 9.8): In IQrouter through 3.3.1, there is a root user without a password, which allows attackers to gain full remote access…
CVE-2020-11963 — Critical (CVSS 9.8): IQrouter through 3.3.1, when unconfigured, has multiple remote code execution vulnerabilities in the web-panel because…
CVE-2020-11968 — High (CVSS 7.5): In the web-panel in IQrouter through 3.3.1, remote attackers can read system logs because of Incorrect Access Control.…
CVE-2020-11964 — High (CVSS 7.5): In IQrouter through 3.3.1, the Lua function diag_set_password in the web-panel allows remote attackers to change the…

All CVEs affecting Evenroute Iqrouter Firmware →

Other CWE-521 (Weak Password Requirements) vulnerabilities

CVE-2026-25715 — Critical (CVSS 9.8): The web management interface of the device allows the administrator username and password to be set to blank values.…
CVE-2025-53963 — Critical (CVSS 9.8): An issue was discovered on Thermo Fisher Ion Torrent OneTouch 2 INS1005527 devices. They run an SSH server accessible…
CVE-2025-63747 — Critical (CVSS 9.8): QaTraq 6.9.2 ships with administrative account credentials which are enabled in default installations and permit…
CVE-2025-12552 — Critical (CVSS 9.8): Insufficient Password Policy.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.
CVE-2025-11200 — Critical (CVSS 9.8): MLflow Weak Password Requirements Authentication Bypass Vulnerability. This vulnerability allows remote attackers to…
CVE-2025-12364 — Critical (CVSS 9.8): Weak Password Policy.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.

Browse all CWE-521 (Weak Password Requirements) vulnerabilities →