How severe is CVE-2018-20394?

CVE-2018-20394 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-2018-20394 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-2018-20394?

CVE-2018-20394 primarily affects Technicolor Dwg849 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20394?

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-2018-20394 published?

CVE-2018-20394 was published on 2018-12-23 and last updated on 2026-06-17.

CVE-2018-20394

CVE-2018-20394 is a critical-severity vulnerability in Technicolor Dwg849 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: Technicolor Dwg849 Firmware
Published: 2018-12-23
Last modified: 2026-06-17

Description

Thomson DWG849 STC0.01.16, DWG850-4 ST9C.05.25, DWG855 ST80.20.26, and TWG870 STB2.01.36 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-2018-20394?: Thomson DWG849 STC0.01.16, DWG850-4 ST9C.05.25, DWG855 ST80.20.26, and TWG870 STB2.01.36 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-2018-20394?: CVE-2018-20394 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-2018-20394 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-2018-20394?: CVE-2018-20394 primarily affects Technicolor Dwg849 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20394?: 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-2018-20394 published?: CVE-2018-20394 was published on 2018-12-23 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:technicolor:dwg849_firmware:stc0.01.16:*:*:*:*:*:*:*
cpe:2.3:o:technicolor:dwg850-4_firmware:st9c.05.25:*:*:*:*:*:*:*
cpe:2.3:o:technicolor:dwg855_firmware:st80.20.26:*:*:*:*:*:*:*
cpe:2.3:o:technicolor:twg870_firmware:stb2.01.36:*:*:*:*:*:*:*

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