How severe is CVE-2025-6443?

CVE-2025-6443 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-6443 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-6443?

CVE-2025-6443 affects Mikrotik Routeros. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-6443?

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-2025-6443 have an EU (EUVD) identifier?

Yes. CVE-2025-6443 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28736.

When was CVE-2025-6443 published?

CVE-2025-6443 was published on 2025-06-25 and last updated on 2026-06-17.

CVE-2025-6443

CVE-2025-6443 is a high-severity vulnerability in Mikrotik Routeros 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-284.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-28736
Weakness: CWE-284
Affected product: Mikrotik Routeros
Published: 2025-06-25
Last modified: 2026-06-17

Description

Mikrotik RouterOS VXLAN Source IP Improper Access Control Vulnerability. This vulnerability allows remote attackers to bypass access restrictions on affected installations of Mikrotik RouterOS. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of remote IP addresses when processing VXLAN traffic. The issue results from the lack of validation of the remote IP address against configured values prior to allowing ingress traffic into the internal network. An attacker can leverage this vulnerability to gain access to internal network resources. Was ZDI-CAN-26415.

Frequently asked questions

What is CVE-2025-6443?: Mikrotik RouterOS VXLAN Source IP Improper Access Control Vulnerability. This vulnerability allows remote attackers to bypass access restrictions on affected installations of Mikrotik RouterOS. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of remote IP addresses when processing VXLAN traffic. The issue results from the lack of validation of the remote IP address against configured values prior to allowing ingress traffic into the internal network. An attacker can leverage this vulnerability to gain access to internal network resources. Was ZDI-CAN-26415.
How severe is CVE-2025-6443?: CVE-2025-6443 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-6443 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-6443?: CVE-2025-6443 affects Mikrotik Routeros. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-6443?: 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-2025-6443 have an EU (EUVD) identifier?: Yes. CVE-2025-6443 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28736.
When was CVE-2025-6443 published?: CVE-2025-6443 was published on 2025-06-25 and last updated on 2026-06-17.

References

https://www.zerodayinitiative.com/advisories/ZDI-25-424/

Affected products (1)

cpe:2.3:o:mikrotik:routeros:*:*:*:*:-:*:*:*

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Browse all CWE-284 (Improper Access Control) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

35.130.111.98 (ipv4-addr)
27.110.176.222 (ipv4-addr)