How severe is CVE-2020-13859?

CVE-2020-13859 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-2020-13859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13859?

CVE-2020-13859 affects Mofinetwork Mofi4500-4gxelte Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13859?

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-2020-13859 published?

CVE-2020-13859 was published on 2021-02-01 and last updated on 2026-06-17.

CVE-2020-13859

CVE-2020-13859 is a critical-severity vulnerability in Mofinetwork Mofi4500-4gxelte 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Mofinetwork Mofi4500-4gxelte Firmware
Published: 2021-02-01
Last modified: 2026-06-17

Description

An issue was discovered on Mofi Network MOFI4500-4GXeLTE 4.0.8-std devices. A format error in /etc/shadow, coupled with a logic bug in the LuCI - OpenWrt Configuration Interface framework, allows the undocumented system account mofidev to login to the cgi-bin/luci/quick/wizard management interface without a password by abusing a forgotten-password feature.

Frequently asked questions

What is CVE-2020-13859?: An issue was discovered on Mofi Network MOFI4500-4GXeLTE 4.0.8-std devices. A format error in /etc/shadow, coupled with a logic bug in the LuCI - OpenWrt Configuration Interface framework, allows the undocumented system account mofidev to login to the cgi-bin/luci/quick/wizard management interface without a password by abusing a forgotten-password feature.
How severe is CVE-2020-13859?: CVE-2020-13859 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-2020-13859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13859?: CVE-2020-13859 affects Mofinetwork Mofi4500-4gxelte Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13859?: 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-2020-13859 published?: CVE-2020-13859 was published on 2021-02-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:mofinetwork:mofi4500-4gxelte_firmware:4.0.8-std:*:*:*:*:*:*:*

More vulnerabilities in Mofinetwork Mofi4500-4gxelte Firmware

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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