How severe is CVE-2018-20391?

CVE-2018-20391 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-2018-20391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20391?

CVE-2018-20391 affects Teknotel Cbw700n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20391?

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-2018-20391 published?

CVE-2018-20391 was published on 2018-12-23 and last updated on 2026-06-17.

CVE-2018-20391

CVE-2018-20391 is a critical-severity vulnerability in Teknotel Cbw700n 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% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Teknotel Cbw700n Firmware
Published: 2018-12-23
Last modified: 2026-06-17

Description

TEKNOTEL CBW700N 81.447.392110.729.024 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-2018-20391?: TEKNOTEL CBW700N 81.447.392110.729.024 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-2018-20391?: CVE-2018-20391 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-2018-20391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20391?: CVE-2018-20391 affects Teknotel Cbw700n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20391?: 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-2018-20391 published?: CVE-2018-20391 was published on 2018-12-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:teknotel:cbw700n_firmware:81.447.392110.729.024:*:*:*:*:*:*:*

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