CVE-2025-6393: A vulnerability was found in TOTOLINK A702R, A3002R, A3002RU and EX1200T 3.0.0-B20230809.1615/4.0.0-B20230531.

This month

HIGH 8.8MITIGATEMITIGATEMITIGATE

CVE-2025-6393 is a high-severity flaw (CVSS 8.8) affecting a3002ru firmware, a3002r firmware, a702r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in TOTOLINK A702R, A3002R, A3002RU and EX1200T 3.0.0-B20230809.1615/4.0.0-B20230531.1404/4.0.0-B20230721.1521/4.1.2cu.5232_B20210713. It has been classified as critical. Affected is an unknown function of the file /boafrm/formIPv6Addr of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclose

Why this priority

High severity
Public exploit reference

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	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2025-06-21
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

2025-06-21 01:15 UTCPublished CVE record published
2026-06-17 10:01 UTCUpdated Record last modified

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.

totolink a3002r firmware MITIGATE

Affected: 4.0.0-b20230531.1404

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0-b20230531.1404

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 a702r firmware MITIGATE

Affected: 4.0.0-b20230721.1521

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0-b20230721.1521

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 ex1200t firmware MITIGATE

Affected: 4.1.2cu.5232_b20210713

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.2cu.5232_b20210713

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-2025-6393?

a3002ru firmware: mitigate or apply the listed mitigation; a3002r firmware: mitigate or apply the listed mitigation; a702r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-6393 being exploited?

CVE-2025-6393 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-2025-6393 affect?

CVE-2025-6393 affects a3002ru firmware, a3002r firmware, a702r firmware. Severity is high (CVSS 8.8). A vulnerability was found in TOTOLINK A702R, A3002R, A3002RU and EX1200T 3.0.0-B20230809.1615/4.0.0-B20230531.1404/4.0.0-B20230721.1521/4.1.2cu.5232_B20210713. It has been classified as critical. Affected is an unknown function of the file

How urgent is CVE-2025-6393?

Priority 52/100. High severity; Public exploit reference

Related CVEs

CVE-2026-26731 HIGH 8.8 MITIGATE TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the routern
CVE-2026-26736 HIGH 8.8 UPGRADE TOTOLINK A3002RU_V3 V3.0.0-B20220304.1804 was discovered to contain a stack-based buffer overflow via the stat
CVE-2026-26732 HIGH 8.8 MITIGATE TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the vpnUser
CVE-2025-6953 HIGH 8.8 MITIGATE A vulnerability, which was classified as critical, was found in TOTOLINK A3002RU 3.0.0-B20230809.1615
CVE-2025-6939 HIGH 8.8 MITIGATE A vulnerability classified as critical has been found in TOTOLINK A3002RU 3.0.0-B20230809.1615

References

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