CVE-2021-36380 — Sureline
CRITICALCVE-2021-36380 is a critical-severity (CVSS 9.8) OS Command Injection vulnerability in sunhillo sureline. It is in CISA's Known Exploited Vulnerabilities catalog (added 2024-03-05) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDiag.cgi.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2024-03-05. Federal agencies were required to remediate by 2024-03-26.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2021-36380.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-36380 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDiag.cgi.
Affected Products
surelinesunhilloResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Inj…
Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Inj…
Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Inj…
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every sunhillo sureline deployment and check each version against the affected-products list above.
Fix
Apply the sunhillo sureline security patch or hotfix for CVE-2021-36380 on the affected version, following the vendor advisory for your exact build.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
How to detect CVE-2021-36380
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2021-36380 -u https://target- Template
- Sunhillo SureLine <8.7.0.1.1 - Unauthenticated OS Command Injection
- Severity
- critical
- Impact
- Successful exploitation of this vulnerability allows remote attackers to execute arbitrary commands on the affected system.
- Remediation
- Upgrade to Sunhillo SureLine version 8.7.0.1.1 or later to mitigate this vulnerability.
Template by ProjectDiscovery nuclei-templates (gy741), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2021-36380 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.