HOMEVULNERABILITIESCVE-2021-36923
HIGH

CVE-2021-36923

NVD-CWE-noinfoPublished: November 2, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

RtsUpx.sys in Realtek RtsUpx USB Utility Driver for Camera/Hub/Audio through 1.14.0.0 allows local low-privileged users to achieve unauthorized access to USB device privileged IN and OUT instructions (leading to Escalation of Privileges, Denial of Service, Code Execution, and Information Disclosure) via a crafted Device IO Control packet to a device.

NVD Source

Technical Analysis

CVE-2021-36923 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

realtek1 product(s)
rtsupx usb utility driver
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.realtek.com/images/safe-report/Realtek_RtsUpx_Security_Advisory_Report.pdf
ADVISORYhttps://www.realtek.com/images/safe-report/Realtek_RtsUpx_Security_Advisory_Report.pdf

All References (4)

→
https://www.realtek.com/images/safe-report/Realtek_RtsUpx_Security_Advisory_Report.pdfVendor Advisory
→
https://www.sentinelone.com/resources/category/report/Not Applicable
→
https://www.realtek.com/images/safe-report/Realtek_RtsUpx_Security_Advisory_Report.pdfVendor Advisory
→
https://www.sentinelone.com/resources/category/report/Not Applicable

Quick Facts

CVE IDCVE-2021-36923
CVSS Score7.8 / 10
SeverityHIGH
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedNov 2, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2021-2256
10.0
CVE-2021-2317
10.0
CVE-2021-2177
10.0
CVE-2021-2248
10.0
CVE-2021-2244
10.0
CVE-2016-20010
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-36923 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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