How severe is CVE-2026-1686?

CVE-2026-1686 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-2026-1686 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-1686?

CVE-2026-1686 affects Totolink A3600r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-1686?

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-2026-1686 have an EU (EUVD) identifier?

Yes. CVE-2026-1686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5027.

When was CVE-2026-1686 published?

CVE-2026-1686 was published on 2026-01-30 and last updated on 2026-06-17.

CVE-2026-1686

CVE-2026-1686 is a high-severity vulnerability in Totolink A3600r 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% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5027
Weakness: CWE-119
Affected product: Totolink A3600r Firmware
Published: 2026-01-30
Last modified: 2026-06-17

Description

A security flaw has been discovered in Totolink A3600R 5.9c.4959. This issue affects the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. Performing a manipulation of the argument apcliSsid results in buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

Frequently asked questions

What is CVE-2026-1686?: A security flaw has been discovered in Totolink A3600R 5.9c.4959. This issue affects the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. Performing a manipulation of the argument apcliSsid results in buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.
How severe is CVE-2026-1686?: CVE-2026-1686 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-2026-1686 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-1686?: CVE-2026-1686 affects Totolink A3600r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-1686?: 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-2026-1686 have an EU (EUVD) identifier?: Yes. CVE-2026-1686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5027.
When was CVE-2026-1686 published?: CVE-2026-1686 was published on 2026-01-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:a3600r_firmware:5.9c.4959:*:*:*:*:*:*:*

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