Is CVE-2019-15803 in the CISA KEV catalog?

No. CVE-2019-15803 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-15803?

CVE-2019-15803 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2019-15803?

CVE-2019-15803 has an EPSS score of 1.32% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-15803?

Upgrade gs1900-10hp firmware to 2.50(aazi.0)c0 or later. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2019-15803

CRITICAL

9.1

CVSS v3

NVD

Description

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fds_sys_passDebugPasswd_ret(). The firmware contains access control checks that determine if remote users are allowed to access this functionality. The function that performs this check (fds_sys_remoteDebugEnable_ret in libfds.so) always return TRUE with no actual checks performed. The diagnostics menu allows for reading/writing arbitrary registers and various other configuration parameters which are believed to be related to the network interface chips.

CWE-287Improper Authentication

How to fix

Remediation Available

gs1900-10hp firmwareNVD

Affected:< 2.50(aazi.0)c0Fixed in:2.50(aazi.0)c0CVE-2019-15803derived from NVD

gs1900-16 firmwareNVD

Affected:< 2.50(aahj.0)c0Fixed in:2.50(aahj.0)c0CVE-2019-15803derived from NVD

gs1900-24 firmwareNVD

Affected:< 2.50(aahl.0)c0Fixed in:2.50(aahl.0)c0CVE-2019-15803derived from NVD

gs1900-24e firmwareNVD

Affected:< 2.50(aahk.0)c0Fixed in:2.50(aahk.0)c0CVE-2019-15803derived from NVD

gs1900-24hp firmwareNVD

Affected:< 2.50(aahm.0)c0Fixed in:2.50(aahm.0)c0CVE-2019-15803derived from NVD

gs1900-48 firmwareNVD

Affected:< 2.50(aahn.0)c0Fixed in:2.50(aahn.0)c0CVE-2019-15803derived from NVD

gs1900-48hp firmwareNVD

Affected:< 2.50(aaho.0)c0Fixed in:2.50(aaho.0)c0CVE-2019-15803derived from NVD

gs1900-8 firmwareNVD

Affected:< 2.50(aahh.0)c0Fixed in:2.50(aahh.0)c0CVE-2019-15803derived from NVD

gs1900-8hp firmwareNVD

Affected:< 2.50(aahi.0)c0Fixed in:2.50(aahi.0)c0CVE-2019-15803derived 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

1.32%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Exploit1

jasper.la

Vendor Advisory1

zyxel.com

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-35082	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-35078	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-7921	Critical	9.8	100%	KEV	-
CVE-2024-7593	Critical	9.8	100%	KEV	-
CVE-2023-46805	High	8.2	100%	KEV + Ransom	-
CVE-2022-40684	Critical	9.8	100%	KEV + Ransom	Fix

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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.