CVE-2021-36380

Name: CVE-2021-36380
Creator: NVD / NIST
Published: 2021-08-13T16:15:07.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 97.60%

Last modified Jun 17, 2026

CVE-2021-36380 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDiag.cgi.. CISA has confirmed active exploitation in the wild. EPSS estimates a 97.60% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

97.60%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Mar 26, 2024.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sunhillo	Sureline	< 8.7.0.1.1

References

https://research.nccgroup.com/2021/07/26/technical-advisory-sunhillo-sureline-unauthenticated-os-command-injection-cve-2021-36380/Exploit, Third Party Advisory
https://www.sunhillo.com/product/sureline/Product
https://research.nccgroup.com/2021/07/26/technical-advisory-sunhillo-sureline-unauthenticated-os-command-injection-cve-2021-36380/Exploit, Third Party Advisory
https://www.sunhillo.com/product/sureline/Product
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36380US Government Resource

Timeline

Published: Aug 13, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-36380?

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

How severe is CVE-2021-36380?

CVE-2021-36380 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 97.60% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-36380?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36380?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST