How severe is CVE-2018-20398?

CVE-2018-20398 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-2018-20398 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20398?

CVE-2018-20398 primarily affects Skyworthdigital Cm5100 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20398?

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-2018-20398 published?

CVE-2018-20398 was published on 2018-12-23 and last updated on 2026-06-17.

CVE-2018-20398

CVE-2018-20398 is a critical-severity vulnerability in Skyworthdigital Cm5100 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-522.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Skyworthdigital Cm5100 Firmware
Published: 2018-12-23
Last modified: 2026-06-17

Description

Skyworth CM5100 V1.1.0, CM5100-440 V1.2.1, CM5100-511 4.1.0.14, CM5100-GHD00 V1.2.2, and CM5100.g2 4.1.0.17 devices allow remote attackers to discover credentials via iso.3.6.1.4.1.4491.2.4.1.1.6.1.1.0 and iso.3.6.1.4.1.4491.2.4.1.1.6.1.2.0 SNMP requests.

Frequently asked questions

What is CVE-2018-20398?: Skyworth CM5100 V1.1.0, CM5100-440 V1.2.1, CM5100-511 4.1.0.14, CM5100-GHD00 V1.2.2, and CM5100.g2 4.1.0.17 devices allow remote attackers to discover credentials via iso.3.6.1.4.1.4491.2.4.1.1.6.1.1.0 and iso.3.6.1.4.1.4491.2.4.1.1.6.1.2.0 SNMP requests.
How severe is CVE-2018-20398?: CVE-2018-20398 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-2018-20398 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20398?: CVE-2018-20398 primarily affects Skyworthdigital Cm5100 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20398?: 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-2018-20398 published?: CVE-2018-20398 was published on 2018-12-23 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:o:skyworthdigital:cm5100_firmware:1.1.0:*:*:*:*:*:*:*
cpe:2.3:o:skyworthdigital:cm5100-440_firmware:1.2.1:*:*:*:*:*:*:*
cpe:2.3:o:skyworthdigital:cm5100-511_firmware:4.1.0.14:*:*:*:*:*:*:*
cpe:2.3:o:skyworthdigital:cm5100-ghd00_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:skyworthdigital:cm5100.g2_firmware:4.1.0.17:*:*:*:*:*:*:*

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