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Exploited vulnerability · CISA KEV

Is CVE-2021-36380 exploited? Yes: in CISA KEV since 5 Mar 2024

Gociux · Sunhillo SureLine · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-36380, Sunhillo SureLine OS Command Injection Vulnerablity, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 5 Mar 2024, 935 days after it was published. It affects Sunhillo SureLine. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 5 Mar 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due26 Mar 2024BOD 22-01 deadline

What it is

Sunhillo SureLine contains an OS command injection vulnerability that allows an attacker to cause a denial-of-service or utilize the device for persistence on the network via shell metacharacters in ipAddr or dnsAddr in /cgi/networkDiag.cgi.

VendorSunhillo (1 exploited CVE in KEV)
ProductSureLine
VulnerabilitySunhillo SureLine OS Command Injection Vulnerablity
WeaknessCWE-78
Published13 Aug 2021
Added to KEV5 Mar 2024
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for SureLine in your asset inventory, including appliances and cloud images. Stack check lists every exploited Sunhillo CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 13 Aug 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Sunhillo.

References

Questions

Is CVE-2021-36380 being exploited?

Yes. CISA added CVE-2021-36380 to the Known Exploited Vulnerabilities catalog on 5 Mar 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-36380 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-36380?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Sunhillo's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected SureLine and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2024 · act-now radar.

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