What is the CVSS score of CVE-2021-35402?

CVE-2021-35402 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.4%.

How to fix or mitigate CVE-2021-35402?

Within 24 hours: Identify and inventory all PROLiNK PRC2402M devices in your environment and isolate them from untrusted networks. Within 7 days: Implement network segmentation to restrict access to the live_api.cgi interface and deploy WAF rules blocking requests containing shell metacharacters to the ip parameter. Within 30 days: Contact PROLiNK for patch availability, evaluate replacement with patched firmware versions, or consider decommissioning affected devices if patches remain unavailable.

CVE-2021-35402

CRITICAL

OS Command Injection (CWE-78)

2026-02-20 cve@mitre.org

Command Injection

10.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

10.0 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

CVE Published

Feb 20, 2026 - 19:23 nvd

CRITICAL 10.0

DescriptionCVE.org

PROLiNK PRC2402M 20190909 before 2021-06-13 allows live_api.cgi?page=satellite_list OS command injection via shell metacharacters in the ip parameter (for satellite_status).