How severe is CVE-2021-36380?

CVE-2021-36380 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-36380 being actively exploited?

Yes. CVE-2021-36380 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-03-05, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-36380?

CVE-2021-36380 affects Sunhillo Sureline. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36380?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-36380 have an EU (EUVD) identifier?

Yes. CVE-2021-36380 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-22996. It is also flagged as exploited in the EUVD (since 2024-03-05).

When was CVE-2021-36380 published?

CVE-2021-36380 was published on 2021-08-13 and last updated on 2026-06-17.

CVE-2021-36380

CVE-2021-36380 is a critical-severity vulnerability in Sunhillo Sureline with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-03-05). The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 98% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2024-03-05)
EU (EUVD) id: EUVD-2021-22996
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-03-05)
Weakness: CWE-78
Affected product: Sunhillo Sureline
Published: 2021-08-13
Last modified: 2026-06-17

Description

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

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 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-36380 being actively exploited?: Yes. CVE-2021-36380 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-03-05, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2021-36380?: CVE-2021-36380 affects Sunhillo Sureline. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36380?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2021-36380 have an EU (EUVD) identifier?: Yes. CVE-2021-36380 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-22996. It is also flagged as exploited in the EUVD (since 2024-03-05).
When was CVE-2021-36380 published?: CVE-2021-36380 was published on 2021-08-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sunhillo:sureline:*:*:*:*:*:*:*:*

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-56004 — Critical (CVSS 10.0): A shellcode injection in the mercurial handler of the obs tar_scm source service before version 0.12.4 could be used by…
CVE-2026-56415 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability within the debug.pl script that is…
CVE-2026-56413 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability in the ms_service.pl service, which listens…
CVE-2026-49869 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in…
CVE-2026-49261 — Critical (CVSS 10.0): MariaDB server is a community developed fork of MySQL server. Versions 10.6.1 through 10.6.26, 10.11.1 through…
CVE-2026-10520 — Critical (CVSS 10.0): An OS Command Injection vulnerability in Ivanti Sentry before the R10.5.2, R10.6.2 and R10.7.1 versions allows a…

Browse all CWE-78 (OS Command Injection) vulnerabilities →