CVE-2025-9781: A vulnerability has been found in TOTOLINK A702R 4.0.0-B20211108.1423

This month

HIGH 8.8MITIGATE

CVE-2025-9781 is a high-severity flaw (CVSS 8.8) affecting a702r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in TOTOLINK A702R 4.0.0-B20211108.1423. This affects the function sub_4162DC of the file /boafrm/formFilter. Such manipulation of the argument ip6addr leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Why this priority

High severity

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2025-09-01
Last modified	2026-09-26

Publisher (CNA): VulDB · Vendor: totolink

Last updated 2026-09-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-01 14:15 UTCPublished CVE record published
2026-09-26 00:10 UTCUpdated Record last modified

totolink a702r firmware MITIGATE

Affected: 4.0.0-b20211108.1423

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0-b20211108.1423

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-2025-9781?

a702r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-9781 being exploited?

CVE-2025-9781 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-2025-9781 affect?

CVE-2025-9781 affects a702r firmware. Severity is high (CVSS 8.8). A vulnerability has been found in TOTOLINK A702R 4.0.0-B20211108.1423. This affects the function sub_4162DC of the file /boafrm/formFilter. Such manipulation of the argument ip6addr leads to buffer overflow. The attack can be launched remot

How urgent is CVE-2025-9781?

Priority 44/100. High severity

Related CVEs

CVE-2025-9779 HIGH 8.8 MITIGATE A vulnerability was detected in TOTOLINK A702R 4.0.0-B20211108.1423
CVE-2025-9780 HIGH 8.8 MITIGATE A flaw has been found in TOTOLINK A702R 4.0.0-B20211108.1423
CVE-2025-9782 HIGH 8.8 MITIGATE A vulnerability was found in TOTOLINK A702R 4.0.0-B20211108.1423
CVE-2025-9783 HIGH 8.8 MITIGATE A vulnerability was determined in TOTOLINK A702R 4.0.0-B20211108.1423
CVE-2025-8140 HIGH 8.8 MITIGATE A vulnerability was found in TOTOLINK A702R 4.0.0-B20230721.1521

References

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