How severe is CVE-2025-7758?

CVE-2025-7758 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-7758 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-7758?

CVE-2025-7758 affects Totolink T6 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-7758?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-7758 have an EU (EUVD) identifier?

Yes. CVE-2025-7758 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21820.

When was CVE-2025-7758 published?

CVE-2025-7758 was published on 2025-07-17 and last updated on 2026-06-17.

CVE-2025-7758

CVE-2025-7758 is a high-severity vulnerability in Totolink T6 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-21820
Weakness: CWE-119
Affected product: Totolink T6 Firmware
Published: 2025-07-17
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-7758?: 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.
How severe is CVE-2025-7758?: CVE-2025-7758 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-7758 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-7758?: CVE-2025-7758 affects Totolink T6 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-7758?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-7758 have an EU (EUVD) identifier?: Yes. CVE-2025-7758 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21820.
When was CVE-2025-7758 published?: CVE-2025-7758 was published on 2025-07-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:t6_firmware:v4.1.5cu.748_b20211015:*:*:*:*:*:*:*

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