How severe is CVE-2025-4851?

CVE-2025-4851 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-4851 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4851?

CVE-2025-4851 affects Totolink N300rh Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-4851?

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

Does CVE-2025-4851 have an EU (EUVD) identifier?

Yes. CVE-2025-4851 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15618.

When was CVE-2025-4851 published?

CVE-2025-4851 was published on 2025-05-18 and last updated on 2026-06-17.

CVE-2025-4851

CVE-2025-4851 is a medium-severity vulnerability in Totolink N300rh Firmware with a CVSS 3.x base score of 6.3. 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: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 5.3
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-15618
Weakness: CWE-77
Affected product: Totolink N300rh Firmware
Published: 2025-05-18
Last modified: 2026-06-17

Description

A vulnerability classified as critical was found in TOTOLINK N300RH 6.1c.1390_B20191101. This vulnerability affects the function setUploadUserData of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument FileName leads to command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2025-4851?: A vulnerability classified as critical was found in TOTOLINK N300RH 6.1c.1390_B20191101. This vulnerability affects the function setUploadUserData of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument FileName leads to command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2025-4851?: CVE-2025-4851 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-4851 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4851?: CVE-2025-4851 affects Totolink N300rh Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-4851?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4851 have an EU (EUVD) identifier?: Yes. CVE-2025-4851 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15618.
When was CVE-2025-4851 published?: CVE-2025-4851 was published on 2025-05-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:n300rh_firmware:6.1c.1390_b20191101:*:*:*:*:*:*:*

More vulnerabilities in Totolink N300rh Firmware

CVE-2026-3301 — Critical (CVSS 9.8): A security flaw has been discovered in Totolink N300RH 6.1c.1353_B20190305. Affected by this vulnerability is the…
CVE-2025-6400 — High (CVSS 8.8): A vulnerability was found in TOTOLINK N300RH 6.1c.1390_B20191101 and classified as critical. Affected by this issue is…
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CVE-2025-4849 — Medium (CVSS 6.3): A vulnerability was found in TOTOLINK N300RH 6.1c.1390_B20191101. It has been rated as critical. Affected by this issue…
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