How severe is CVE-2021-20121?

CVE-2021-20121 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over physical access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-20121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20121?

CVE-2021-20121 affects Telus Prv65b444a-s-ts Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20121?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20121 published?

CVE-2021-20121 was published on 2021-10-11 and last updated on 2026-06-17.

CVE-2021-20121

CVE-2021-20121 is a medium-severity vulnerability in Telus Prv65b444a-s-ts Firmware with a CVSS 3.x base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
CVSS v2: 1.9
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Telus Prv65b444a-s-ts Firmware
Published: 2021-10-11
Last modified: 2026-06-17

Description

The Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is vulnerable to an authenticated arbitrary file read. An authenticated user with physical access to the device can read arbitrary files from the device by preparing and connecting a specially prepared USB drive to the device, and making a series of crafted requests to the device's web interface.

Frequently asked questions

What is CVE-2021-20121?: The Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is vulnerable to an authenticated arbitrary file read. An authenticated user with physical access to the device can read arbitrary files from the device by preparing and connecting a specially prepared USB drive to the device, and making a series of crafted requests to the device's web interface.
How severe is CVE-2021-20121?: CVE-2021-20121 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over physical access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-20121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20121?: CVE-2021-20121 affects Telus Prv65b444a-s-ts Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20121?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20121 published?: CVE-2021-20121 was published on 2021-10-11 and last updated on 2026-06-17.

References

https://www.tenable.com/security/research/tra-2021-41

Affected products (1)

cpe:2.3:o:telus:prv65b444a-s-ts_firmware:3.00.20:*:*:*:*:*:*:*

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