CVE-2025-63462: Totolink A7000R v9.1.0u.6115_B20201022 was discovered to contain a stack overflow via the wifiOff parameter in

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HIGH 7.5REMOTEMITIGATE

CVE-2025-63462 is a high-severity flaw (CVSS 7.5) affecting a7000r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Totolink A7000R v9.1.0u.6115_B20201022 was discovered to contain a stack overflow via the wifiOff parameter in the sub_421A04 function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-121
Published	2025-10-31
Last modified	2026-10-27

Publisher (CNA): MITRE · Vendor: totolink

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-31 17:15 UTCPublished CVE record published
2026-10-27 11:10 UTCUpdated Record last modified

totolink a7000r firmware MITIGATE

Affected: 9.1.0u.6115_b20201022

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.1.0u.6115_b20201022

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-2025-63462?

a7000r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-63462 being exploited?

CVE-2025-63462 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-2025-63462 affect?

CVE-2025-63462 affects a7000r firmware. Severity is high (CVSS 7.5). Totolink A7000R v9.1.0u.6115_B20201022 was discovered to contain a stack overflow via the wifiOff parameter in the sub_421A04 function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.

How urgent is CVE-2025-63462?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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