CVE-2020-7997: ASUS WRT-AC66U 3 RT 3.0.0.4.372_67 devices allow XSS via the Client Name field to the Parental Control feature

This month

MEDIUM 6.1MITIGATE

CVE-2020-7997 is a medium-severity flaw (CVSS 6.1) affecting rt-ac66u firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ASUS WRT-AC66U 3 RT 3.0.0.4.372_67 devices allow XSS via the Client Name field to the Parental Control feature.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-01-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: asus

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

Am I affected?

Timeline

2020-01-28 05:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

asus rt-ac66u firmware MITIGATE

Affected: 3.0.0.4.372_67

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0.4.372_67

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-2020-7997?

rt-ac66u firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-7997 being exploited?

CVE-2020-7997 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-2020-7997 affect?

CVE-2020-7997 affects rt-ac66u firmware. Severity is medium (CVSS 6.1). ASUS WRT-AC66U 3 RT 3.0.0.4.372_67 devices allow XSS via the Client Name field to the Parental Control feature.

How urgent is CVE-2020-7997?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2018-9285 CRITICAL 9.8 UPGRADE UPGRADE Main_Analysis_Content.asp in /apply.cgi on ASUS RT-AC66U, RT-AC68U, RT-AC86U, RT-AC88U, RT-AC1900, RT-AC2900,
CVE-2018-8879 CRITICAL 9.8 UPGRADE Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware bef
CVE-2018-8826 CRITICAL 9.8 MITIGATE MITIGATE ASUS RT-AC51U, RT-AC58U, RT-AC66U, RT-AC1750, RT-ACRH13, and RT-N12 D1 routers with firmware before 3.0.0.4.38
CVE-2017-11420 CRITICAL 9.8 UPGRADE UPGRADE Stack-based buffer overflow in ASUS_Discovery.c in networkmap in Asuswrt-Merlin firmware for ASUS devices and
CVE-2017-11345 HIGH 7.8 UPGRADE UPGRADE Stack buffer overflow in networkmap in Asuswrt-Merlin firmware for ASUS devices and ASUS firmware for ASUS RT-

References

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