CVE-2021-36380

CRITICALNVD 9.89.8—Trending — 4 sources updated this weekExploited in the wild

9.8

Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDiag.cgi.

CVSS v3: 9.8
EG Score: 9.8(high)
EPSS: 99.9%
KEV: ⚠ Exploited

Published

August 13, 2021

Last Modified

November 5, 2025

Advisory Details (3)

Auto-updated Jun 1, 2026

⚠️ Active exploitation confirmed. Patch available. Sources: cisa.

cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36380

generic

SureLine® | Sunhillo

https://www.sunhillo.com/product/sureline/

generic

Cyber Security Research | NCC Group

https://research.nccgroup.com/2021/07/26/technical-advisory-sunhillo-sureline-unauthenticated-os-command-injection-cve-2021-36380/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-78OS Command Injection

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-06 08:06 UTCEG score recompute
2026-06-06 08:06 UTCGHSA enrichment
2026-06-06 03:58 UTCEG score recompute
2026-06-06 03:58 UTCGHSA enrichment
2026-06-05 23:49 UTCEG score recompute
2026-06-05 23:49 UTCGHSA enrichment
2026-06-05 22:43 UTCkev_newly_listed
2026-06-05 19:41 UTCEG score recompute
2026-06-05 19:41 UTCGHSA enrichment
2026-06-05 15:33 UTCEG score recompute
2026-06-05 15:33 UTCGHSA enrichment
2026-06-05 11:25 UTCEG score recompute
2026-06-05 11:25 UTCGHSA enrichment
2026-06-05 07:17 UTCEG score recompute
2026-06-05 07:16 UTCGHSA enrichment
2026-06-05 03:09 UTCEG score recompute
2026-06-05 03:09 UTCGHSA enrichment
2026-06-04 23:01 UTCEG score recompute
2026-06-04 23:01 UTCGHSA enrichment
2026-06-04 18:53 UTCEG score recompute

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Nucleihttp/cves/2021/CVE-2021-36380.yaml
First seen Jan 1, 2021
Sunhillo SureLine <8.7.0.1.1 - Unauthenticated OS Command Injection
Open source ↗

Frequently asked(6)

What is CVE-2021-36380?

CVE-2021-36380 is a critical vulnerability published on August 13, 2021. Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDiag.cgi.

When was CVE-2021-36380 disclosed?

CVE-2021-36380 was first published in the National Vulnerability Database on August 13, 2021, with the most recent update on November 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-36380 actively exploited?

Yes. CISA added CVE-2021-36380 to the Known Exploited Vulnerabilities catalog on March 5, 2024, affecting Sunhillo SureLine. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2021-36380?

CVE-2021-36380 has a CVSS v3 base score of 9.8 (NVD).

Which products are affected by CVE-2021-36380?

CVE-2021-36380 affects Sunhillo SureLine. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2021-36380?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-36380, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-36380

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CVE-2021-36380

📅 Published

🔄 Last Modified

📋 Advisory Details (3)