What is the CVSS score of CVE-2021-43003?

CVE-2021-43003 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.5%.

Is there a public PoC exploit available for CVE-2021-43003?

Yes, a public proof-of-concept exploit is available for CVE-2021-43003. Prioritise patching immediately. EPSS: 0.5%.

Zportal Windows Zclient CVE-2021-43003

HIGH

Integer Overflow or Wraparound (CWE-190)

2021-12-07 cve@mitre.org

Buffer Overflow RCE Microsoft Integer Overflow Denial Of Service Zportal Windows Zclient

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Dec 07, 2021 - 20:15 nvd

HIGH 8.8

DescriptionNVD

Amzetta zPortal Windows zClient is affected by Integer Overflow. IOCTL Handler 0x22001B in the Amzetta zPortal Windows zClient <= v3.2.8180.148 allow local attackers to execute arbitrary code in kernel mode or cause a denial of service (memory corruption and OS crash) via specially crafted I/O Request Packet.

AnalysisAI

Amzetta zPortal Windows zClient is affected by Integer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Integer Overflow (CWE-190), which allows attackers to cause unexpected behavior through arithmetic overflow. Amzetta zPortal Windows zClient is affected by Integer Overflow. IOCTL Handler 0x22001B in the Amzetta zPortal Windows zClient <= v3.2.8180.148 allow local attackers to execute arbitrary code in kernel mode or cause a denial of service (memory corruption and OS crash) via specially crafted I/O Request Packet. Affected products include: Amzetta Zportal Windows Zclient.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate arithmetic operations, use safe integer libraries, check bounds before allocation.