Known exploited vulnerability
CVE-2021-35394
The short answer
CVE-2021-35394 affects n/a n/a and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-12-10: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
Realtek Jungle SDK version v2.x up to v3.4.14B provides a diagnostic tool called 'MP Daemon' that is usually compiled as 'UDPServer' binary. The binary is affected by multiple memory corruption vulnerabilities and an arbitrary command injection vulnerability that can be exploited by remote unauthenticated attackers.
Weakness: CWE-78.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Dec 10, 2021
Federal due date Dec 24, 2021
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Broken LinkExploitThird Party Advisory
- www.realtek.com/en/cu-1-en/cu-1-taiwan-en Broken LinkPatchVendor Advisory
- www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf PatchVendor Advisory
- www.securityfocus.com/archive/1/534765 Broken LinkThird Party AdvisoryVDB Entry
- www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Broken LinkExploitThird Party Advisory
- www.realtek.com/en/cu-1-en/cu-1-taiwan-en Broken LinkPatchVendor Advisory
- www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf PatchVendor Advisory
- www.securityfocus.com/archive/1/534765 Broken LinkThird Party AdvisoryVDB Entry
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35394 US Government Resource
Questions
Is CVE-2021-35394 being exploited?
Yes. CISA added CVE-2021-35394 to its Known Exploited Vulnerabilities catalog on 2021-12-10, with a federal remediation due date of 2021-12-24.
How do I fix CVE-2021-35394?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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