Security readout for executives and security teams
Plain-English summary
CVE-2021-35402 is a critical command-injection flaw in PROLiNK PRC2402M firmware version 20190909, affecting builds before 2021-06-13. A remote attacker could potentially run operating-system commands through a vulnerable web API parameter. For exposed devices, this could mean full device compromise.
Executive priority
Treat as urgent for any deployed PROLiNK PRC2402M devices, particularly internet-exposed or business-critical locations. Prioritize inventory, isolation from untrusted networks, and vendor-confirmed firmware remediation.
Technical view
The issue is CWE-78 OS command injection in live_api.cgi when page=satellite_list, through shell metacharacters in the ip parameter used for satellite_status. CVSS 3.1 is 10.0: network exploitable, low complexity, no privileges, no user interaction, scope changed, and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations using PROLiNK PRC2402M devices with firmware 20190909 or other builds before 2021-06-13 are potentially exposed, especially if the device web interface is reachable from untrusted networks.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The CVSS vector indicates unauthenticated remote exploitability, so exposure of the management/API surface materially increases risk.
Researcher notes
Evidence is limited to CVE data and the STAR Labs advisory reference. The vulnerability details identify the endpoint, parameter, and command-injection class, but the provided bundle does not include exploit status, proof-of-concept status, or detailed vendor remediation text.
Mitigation direction
- Identify all PROLiNK PRC2402M devices and record firmware versions.
- Upgrade affected devices to a vendor-confirmed fixed firmware if available.
- If no confirmed fix is available, contact PROLiNK or follow STAR Labs advisory guidance.
- Restrict device web/API access to trusted management networks only.
- Block internet exposure for affected device management interfaces.
- Monitor for suspicious requests to live_api.cgi and satellite_list.
Validation and detection
- Confirm whether any PRC2402M device runs firmware 20190909 or pre-2021-06-13 builds.
- Verify management interfaces are not reachable from the internet.
- Review access logs for unusual live_api.cgi satellite_list requests.
- Check vendor or advisory documentation for the fixed firmware version.
- Document compensating controls where firmware cannot be updated.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-35402 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://starlabs.sg/advisories/21/21-35402/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.