Threats / Sunhillo / CVE-2021-36380
CVE-2021-36380
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Sunhillo SureLine vulnerability
Sunhillo SureLine contains an OS command injection vulnerability in the network diagnostics CGI endpoint that allows attackers to execute arbitrary commands via shell metacharacters, enabling denial-of-service or network persistence.
Verdict
Today item — known-exploited.
An unauthenticated attacker can inject OS commands through the ipAddr or dnsAddr parameters in /cgi/networkDiag.cgi to disrupt service availability or establish persistent access to the affected device for lateral network movement.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
637 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-03-05).
Probability (EPSS)
EPSS 0.97599 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Sunhillo, SureLine. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-78 OS Command Injection — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious HTTP request with shell metacharacters in the ipAddr or dnsAddr parameter to the networkDiag.cgi endpoint.
Business
The organization's network diagnostic infrastructure becomes a vector for command execution and potential compromise.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute arbitrary OS commands on the SureLine device with the privileges of the web service process.
Business
Attackers gain a foothold to move laterally through the network and establish persistence mechanisms.
3
Lateral reach — past segmentation narrative 3
Attacker
I trigger resource exhaustion or crash the service through denial-of-service payloads.
Business
Critical network diagnostic capabilities become unavailable, disrupting operational visibility and incident response.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05