Security readout for executives and security teams
Plain-English summary
CVE-2021-36380 lets an unauthenticated network attacker run operating-system commands on vulnerable Sunhillo SureLine systems before version 8.7.0.1.1. For executives, this is a critical remote compromise risk for aviation/network infrastructure using SureLine, and CISA marks it as known exploited.
Executive priority
Immediate priority. This is a remotely exploitable, unauthenticated command-injection issue with full impact ratings and CISA KEV status. Confirm whether SureLine is present, isolate reachable interfaces, and upgrade affected systems quickly.
Technical view
The flaw is CWE-78 OS command injection in /cgi/networkDiag.cgi. The CVE description identifies shell metacharacter handling in ipAddr or dnsAddr as the trigger path. CVSS 3.1 is 9.8: network reachable, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Organizations are exposed if they run Sunhillo SureLine versions before 8.7.0.1.1, especially where the affected CGI interface is network reachable. The source bundle does not provide CPEs or a complete affected-version inventory, so asset confirmation is required.
Exploitation context
Active exploitation is supported by CISA KEV inclusion. Public technical advisory material exists, but this assessment does not provide offensive steps. Treat internet-reachable or broadly reachable SureLine management surfaces as urgent until version and exposure are verified.
Researcher notes
Evidence is strong for product, vulnerable version boundary, endpoint, parameter names, CWE, CVSS, and KEV status. The provided affected-product metadata lacks CPEs and lists vendor/product as n/a, so verification should rely on deployed product inventory and vendor advisory details.
Mitigation direction
- Upgrade affected Sunhillo SureLine systems to version 8.7.0.1.1 or later.
- Check current Sunhillo guidance for any additional fixed releases or operational mitigations.
- Restrict network access to SureLine administrative and diagnostic interfaces.
- Prioritize remediation for externally reachable or safety-critical deployments.
- Monitor affected systems for suspicious CGI diagnostic activity.
Validation and detection
- Inventory all Sunhillo SureLine deployments and record running versions.
- Confirm no system is running a version before 8.7.0.1.1.
- Review exposure of /cgi/networkDiag.cgi from untrusted networks.
- Check web or appliance logs for unusual networkDiag.cgi requests.
- Document remediation status for KEV-driven vulnerability management tracking.
Public sources used
Michael Williams reviewed this cited source version on .
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-2021-36380 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
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.
CISA KEV status
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:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.sunhillo.com/product/sureline/CVE reference · x_refsource_MISC
- https://research.nccgroup.com/2021/07/26/technical-advisory-sunhillo-sureline-unauthenticated-os-command-injection-cve-2021-36380/CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36380CVE reference · government-resource
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.