Is CVE-2020-28899 in the CISA KEV catalog?

No. CVE-2020-28899 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-28899?

CVE-2020-28899 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2020-28899?

CVE-2020-28899 has an EPSS score of 1.63% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-28899?

Upgrade lte4506-m606 firmware to v1.00(abdo.6)c0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-28899

CRITICALEPSS 73th pctl

9.1

CVSS v3

NVD

Description

The Web CGI Script on ZyXEL LTE4506-M606 V1.00(ABDO.2)C0 devices does not require authentication, which allows remote unauthenticated attackers (via crafted JSON action data to /cgi-bin/gui.cgi) to use all features provided by the router. Examples: change the router password, retrieve the Wi-Fi passphrase, send an SMS message, or modify the IP forwarding to access the internal network.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

lte4506-m606 firmwareNVD

Affected:< v1.00(abdo.6)c0Fixed in:v1.00(abdo.6)c0CVE-2020-28899derived from NVD

lte7460-m608 firmwareNVD

Affected:< v1.00(abfr.5)c0Fixed in:v1.00(abfr.5)c0CVE-2020-28899derived from NVD

wah7706 firmwareNVD

Affected:< v1.00(abbc.11)c0Fixed in:v1.00(abbc.11)c0CVE-2020-28899derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

1.63%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Vendor Advisory1

zyxel.com

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.