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Vulnerabilities

Vulnerability · CVE-2025-7758

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

Published Jul 17, 2025 · catalog updated Jul 18, 2025 · Totolink T6

Check if you run it

No confirmed exploitation is on record for CVE-2025-7758. EPSS is 0.99%. Act only if a listed version of Totolink T6 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.99%
Remediation
Vendor / distro source
Affected products
vendor Totolink T6 4.1.5cu.748_B20211015

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Totolink T6 4.1.5cu.748_B202110154.1.5cu.748_B20211015

How to fix CVE-2025-7758

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-7758. EPSS is 0.99%. Act only if a listed version of Totolink T6 is installed.

Which versions are affected?

Compare what you have installed with Totolink T6 4.1.5cu.748_B20211015 4.1.5cu.748_B20211015. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.99%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 17, 2025 · EUVD

    Detected

    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 use

  2. Jul 18, 2025 · EUVD

    Updated

    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 use

Sources

  • CVE.orgVulnerability recordCVE-2025-7758

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-7758

    30-day exploitation probability 0.99%

    first.org
  • EUVDVulnerability recordEUVD-2025-21820

    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 le

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.