How severe is CVE-2026-82689?

CVE-2026-82689 has a CVSS 3.x base score of 9.9, rated critical 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-2026-82689 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-82689?

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

When was CVE-2026-82689 published?

CVE-2026-82689 was published on 2026-08-31.

CVE-2026-82689

CVE-2026-82689 is a critical-severity vulnerability with a CVSS 3.x base score of 9.9. 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-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
CVSS v2: 9.0
CVSS v4: 8.6
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Published: 2026-08-31
Last modified: 2026-08-31

Description

A vulnerability was detected in D-Link DNS-320L, DNS-327L, DNS-340L and DNS-345 up to 20260717. Affected is an unknown function of the file /cgi-bin/isomount_mgr.cgi of the component ISO Image Handler. The manipulation of the argument upIsoRootPath results in os command injection. The attack can be executed remotely. The exploit is now public and may be used.

Frequently asked questions

What is CVE-2026-82689?: A vulnerability was detected in D-Link DNS-320L, DNS-327L, DNS-340L and DNS-345 up to 20260717. Affected is an unknown function of the file /cgi-bin/isomount_mgr.cgi of the component ISO Image Handler. The manipulation of the argument upIsoRootPath results in os command injection. The attack can be executed remotely. The exploit is now public and may be used.
How severe is CVE-2026-82689?: CVE-2026-82689 has a CVSS 3.x base score of 9.9, rated critical 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-2026-82689 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-82689?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-82689 published?: CVE-2026-82689 was published on 2026-08-31.

References

Other CWE-77 (Command Injection) vulnerabilities

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CVE-2025-64090 — Critical (CVSS 10.0): This vulnerability allows authenticated attackers to execute commands via the hostname of the device.

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