CVE-2021-20122: The Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is affected by an authenticated command in

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HIGH 7.2MITIGATE

CVE-2021-20122 is a high-severity flaw (CVSS 7.2) affecting prv65b444a-s-ts firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is affected by an authenticated command injection vulnerability in multiple parameters passed to tr69_cmd.cgi. A remote attacker connected to the router's LAN and authenticated with a super user account, or using a bypass authentication vulnerability like CVE-2021-20090 could leverage this issue to run commands or gain a shell as root on the target device.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	6.5% (top 6%)
CISA exploited list	No
Weakness	CWE-78
Published	2021-10-11
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: telus

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-10-11 17:15 UTCPublished CVE record published
2026-06-17 03:33 UTCUpdated Record last modified

telus prv65b444a-s-ts firmware MITIGATE

Affected: 3.00.20

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.00.20

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-20122?

prv65b444a-s-ts firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-20122 being exploited?

CVE-2021-20122 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-20122 affect?

CVE-2021-20122 affects prv65b444a-s-ts firmware. Severity is high (CVSS 7.2). The Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is affected by an authenticated command injection vulnerability in multiple parameters passed to tr69_cmd.cgi. A remote attacker connected to the router's LAN and authentic

How urgent is CVE-2021-20122?

Priority 54/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

Software pages

Wi-Fi vulnerabilities

Related CVEs

CVE-2021-20121 MEDIUM 4.0 MITIGATE The Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is vulnerable to an authenticated arbitrar

References

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