CVE-2025-7758: A vulnerability, which was classified as critical, has been found in TOTOLINK T6 up to 4.1.5cu.748_B20211015

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HIGH 8.8MITIGATE

CVE-2025-7758 is a high-severity flaw (CVSS 8.8) affecting t6 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as critical, has been found in TOTOLINK T6 up to 4.1.5cu.748_B20211015. Affected by this issue is the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi of the component HTTP POST Request Handler. The manipulation of the argument ip leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

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 37%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2025-07-17
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

2025-07-17 22:15 UTCPublished CVE record published
2026-06-17 10:05 UTCUpdated Record last modified

totolink t6 firmware MITIGATE

Affected: v4.1.5cu.748_b20211015

Fixed in: no fixed release known

Safe to downgrade to: a release before v4.1.5cu.748_b20211015

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-2025-7758?

t6 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-7758 being exploited?

CVE-2025-7758 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-2025-7758 affect?

CVE-2025-7758 affects t6 firmware. Severity is high (CVSS 8.8). A vulnerability, which was classified as critical, has been found in TOTOLINK T6 up to 4.1.5cu.748_B20211015. Affected by this issue is the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi of the component HTTP POST Request Handler

How urgent is CVE-2025-7758?

Priority 51/100. High severity; Public exploit reference

Related CVEs

CVE-2025-8170 HIGH 8.8 MITIGATE A vulnerability classified as critical was found in TOTOLINK T6 4.1.5cu.748_B20211015
CVE-2025-7952 MEDIUM 6.3 MITIGATE A vulnerability classified as critical was found in TOTOLINK T6 4.1.5cu.748
CVE-2025-7913 HIGH 8.8 MITIGATE A vulnerability, which was classified as critical, was found in TOTOLINK T6 4.1.5cu.748_B20211015
CVE-2025-7912 HIGH 8.8 MITIGATE A vulnerability, which was classified as critical, has been found in TOTOLINK T6 4.1.5cu.748_B20211015
CVE-2025-7862 HIGH 7.3 MITIGATE A vulnerability has been found in TOTOLINK T6 4.1.5cu.748_B20211015 and classified as critical

References

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