How severe is CVE-2026-2155?

CVE-2026-2155 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-2155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2155?

CVE-2026-2155 affects Dlink Dir-823x Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2155?

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-2026-2155 have an EU (EUVD) identifier?

Yes. CVE-2026-2155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5794.

When was CVE-2026-2155 published?

CVE-2026-2155 was published on 2026-02-08 and last updated on 2026-06-17.

CVE-2026-2155

CVE-2026-2155 is a high-severity vulnerability in Dlink Dir-823x Firmware with a CVSS 3.x base score of 7.2. 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-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 8.3
CVSS v4: 7.3
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5794
Weakness: CWE-78
Affected product: Dlink Dir-823x Firmware
Published: 2026-02-08
Last modified: 2026-06-17

Description

A security flaw has been discovered in D-Link DIR-823X 250416. The affected element is the function sub_4208A0 of the file /goform/set_dmz of the component Configuration Handler. The manipulation of the argument dmz_host/dmz_enable results in os command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Frequently asked questions

What is CVE-2026-2155?: A security flaw has been discovered in D-Link DIR-823X 250416. The affected element is the function sub_4208A0 of the file /goform/set_dmz of the component Configuration Handler. The manipulation of the argument dmz_host/dmz_enable results in os command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.
How severe is CVE-2026-2155?: CVE-2026-2155 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-2155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2155?: CVE-2026-2155 affects Dlink Dir-823x Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2155?: 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-2026-2155 have an EU (EUVD) identifier?: Yes. CVE-2026-2155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5794.
When was CVE-2026-2155 published?: CVE-2026-2155 was published on 2026-02-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dir-823x_firmware:250416:*:*:*:*:*:*:*

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