How severe is CVE-2025-65289?

CVE-2025-65289 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-65289 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65289?

CVE-2025-65289 affects Mercurycom Mr816 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65289?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-65289 have an EU (EUVD) identifier?

Yes. CVE-2025-65289 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202296.

When was CVE-2025-65289 published?

CVE-2025-65289 was published on 2025-12-09 and last updated on 2026-06-17.

CVE-2025-65289

CVE-2025-65289 is a medium-severity vulnerability in Mercurycom Mr816 Firmware with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-202296
Weakness: CWE-79
Affected product: Mercurycom Mr816 Firmware
Published: 2025-12-09
Last modified: 2026-06-17

Description

A stored Cross site scripting (XSS) vulnerability in the Mercury MR816v2 (081C3114 4.8.7 Build 110427 Rel 36550n) router allows a remote attacker on the LAN to inject JavaScript into the router's management UI by submitting a malicious hostname. The injected script is stored and later executed in the context of an administrator's browser (for example after DHCP release/renew triggers the interface to display the stored hostname). Because the management interface uses weak/basic authentication and does not properly protect or isolate session material, the XSS can be used to exfiltrate the admin session and perform administrative actions.

Frequently asked questions

What is CVE-2025-65289?: A stored Cross site scripting (XSS) vulnerability in the Mercury MR816v2 (081C3114 4.8.7 Build 110427 Rel 36550n) router allows a remote attacker on the LAN to inject JavaScript into the router's management UI by submitting a malicious hostname. The injected script is stored and later executed in the context of an administrator's browser (for example after DHCP release/renew triggers the interface to display the stored hostname). Because the management interface uses weak/basic authentication and does not properly protect or isolate session material, the XSS can be used to exfiltrate the admin session and perform administrative actions.
How severe is CVE-2025-65289?: CVE-2025-65289 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-65289 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65289?: CVE-2025-65289 affects Mercurycom Mr816 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65289?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-65289 have an EU (EUVD) identifier?: Yes. CVE-2025-65289 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202296.
When was CVE-2025-65289 published?: CVE-2025-65289 was published on 2025-12-09 and last updated on 2026-06-17.

References

https://damiri.fr/en/cve/CVE-2025-65289

Affected products (1)

cpe:2.3:o:mercurycom:mr816_firmware:081c3114_4.8.7:build_110427:*:*:*:*:*:*

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