CVE-2025-4731: A vulnerability classified as critical has been found in TOTOLINK A3002R and A3002RU 3.0.0-B20230809.1615

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HIGH 8.8MITIGATEMITIGATE

CVE-2025-4731 is a high-severity flaw (CVSS 8.8) affecting a3002r firmware, a3002ru firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability classified as critical has been found in TOTOLINK A3002R and A3002RU 3.0.0-B20230809.1615. This affects an unknown part of the file /boafrm/formPortFw of the component HTTP POST Request Handler. The manipulation of the argument service_type/ip_subnet leads to buffer overflow. It is possible to initiate the attack 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	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2025-05-16
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: totolink

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

Am I affected?

Timeline

2025-05-16 00:15 UTCPublished CVE record published
2026-06-17 09:33 UTCUpdated Record last modified

totolink a3002r firmware MITIGATE

Affected: 3.0.0-b20230809.1615

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0-b20230809.1615

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.

totolink a3002ru firmware MITIGATE

Affected: 3.0.0-b20230809.1615

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0-b20230809.1615

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-2025-4731?

a3002r firmware: mitigate or apply the listed mitigation; a3002ru firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-4731 being exploited?

CVE-2025-4731 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-2025-4731 affect?

CVE-2025-4731 affects a3002r firmware, a3002ru firmware. Severity is high (CVSS 8.8). A vulnerability classified as critical has been found in TOTOLINK A3002R and A3002RU 3.0.0-B20230809.1615. This affects an unknown part of the file /boafrm/formPortFw of the component HTTP POST Request Handler. The manipulation of the argum

How urgent is CVE-2025-4731?

Priority 45/100. High severity

Related CVEs

CVE-2025-6487 HIGH 8.8 MITIGATE A vulnerability was found in TOTOLINK A3002R 1.1.1-B20200824.0128
CVE-2025-6486 HIGH 8.8 MITIGATE A vulnerability was found in TOTOLINK A3002R 1.1.1-B20200824.0128
CVE-2025-6485 MEDIUM 6.3 MITIGATE A vulnerability was found in TOTOLINK A3002R 1.1.1-B20200824.0128
CVE-2025-6393 HIGH 8.8 MITIGATE MITIGATE A vulnerability was found in TOTOLINK A702R, A3002R, A3002RU and EX1200T 3.0.0-B20230809.1615/4.0.0-B20230531.
CVE-2025-6337 HIGH 8.8 MITIGATE MITIGATE A vulnerability was found in TOTOLINK A3002R and A3002RU 3.0.0-B20230809.1615/4.0.0-B20230531.1404

References

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