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Exploited vulnerability · CISA KEV

Is CVE-2021-35394 exploited? Yes: in CISA KEV since 10 Dec 2021

Gociux · Realtek Jungle Software Development Kit (SDK) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-35394, Realtek Jungle SDK Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Dec 2021, 116 days after it was published. It affects Realtek Jungle Software Development Kit (SDK). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 10 Dec 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due24 Dec 2021BOD 22-01 deadline

What it is

RealTek Jungle SDK contains multiple memory corruption vulnerabilities which can allow an attacker to perform remote code execution.

VendorRealtek (3 exploited CVEs in KEV)
ProductJungle Software Development Kit (SDK)
VulnerabilityRealtek Jungle SDK Remote Code Execution Vulnerability
WeaknessCWE-78, CWE-138
Published16 Aug 2021
Added to KEV10 Dec 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Jungle Software Development Kit (SDK) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Realtek CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  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 16 Aug 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Realtek.

References

Questions

Is CVE-2021-35394 being exploited?

Yes. CISA added CVE-2021-35394 to the Known Exploited Vulnerabilities catalog on 10 Dec 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-35394 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-2021-35394?

Apply updates per vendor instructions. Check Realtek's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Jungle Software Development Kit (SDK) 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 December 2021 · Realtek scorecard · act-now radar.

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