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:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-823x Firmware

CVE-2025-29043 — Critical (CVSS 9.8): An issue in dlink DIR 832x 240802 allows a remote attacker to execute arbitrary code via the function 0x417234
CVE-2025-29042 — Critical (CVSS 9.8): An issue in dlink DIR 832x 240802 allows a remote attacker to execute arbitrary code via the macaddr key value to the…
CVE-2025-29041 — Critical (CVSS 9.8): An issue in dlink DIR 823x 240802 allows a remote attacker to execute arbitrary code via the target_addr key value and…
CVE-2025-29040 — Critical (CVSS 9.8): An issue in dlink DIR 823x 240802 allows a remote attacker to execute arbitrary code via the target_addr key value and…
CVE-2024-39962 — Critical (CVSS 9.8): D-Link DIR-823X AX3000 Dual-Band Gigabit Wireless Router v21_D240126 was discovered to contain a remote code execution…
CVE-2025-55848 — High (CVSS 8.8): An issue was discovered in DIR-823 firmware 20250416. There is an RCE vulnerability in the set_cassword settings…

All CVEs affecting Dlink Dir-823x Firmware →

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-19188 — Critical (CVSS 10.0): A critical OS command injection vulnerability has been identified in the Haiwell IoT Cloud HMI Gateway product. The…
CVE-2026-48362 — Critical (CVSS 10.0): ColdFusion is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')…
CVE-2026-16812 — Critical (CVSS 10.0): VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access…
CVE-2026-6516 — Critical (CVSS 10.0): Zohocorp ManageEngine ADAudit Plus versions before 8606 are affected by Unauthenticated Remote code execution due to…
CVE-2026-46339 — Critical (CVSS 10.0): 9Router is an AI router & token saver. From 0.4.30 until 0.4.37, 9Router's src/proxy.js middleware did not protect…
CVE-2026-59726 — Critical (CVSS 10.0): Ruflo is an agent meta-harness for Claude Code and Codex. Prior to 3.16.3, ruflo's default docker-compose deployment…

Browse all CWE-78 (OS Command Injection) vulnerabilities →