What is the CVSS score of CVE-2021-28191?

CVE-2021-28191 has a CVSS 3.1 base score of 4.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 1.8%.

Asmb9 Ikvm Firmware CVE-2021-28191

MEDIUM

Classic Buffer Overflow (CWE-120)

2021-04-06 twcert@cert.org.tw

Buffer Overflow Asmb9 Ikvm Firmware Rs720A E9 Rs24 E Firmware Rs700A E9 Rs4 Firmware Rs700 E9 Rs4 Firmware Esc4000 G4X Firmware Rs700 E9 Rs12 Firmware Rs100 E10 Pi2 Firmware Rs300 E10 Ps4 Firmware Rs300 E10 Rs4 Firmware Rs500A E9 Ps4 Firmware Rs500A E9 Rs4 Firmware Rs500A E9 Rs4 U Firmware E700 G4 Firmware Ws C422 Pro Se Firmware Ws X299 Pro Se Firmware Z11Pa U12 Firmware Z11Pa U12 10G 2S Firmware Knpa U16 Firmware Esc4000 Dhd G4 Firmware Esc4000 G4 Firmware Rs720Q E9 Rs24 S Firmware Rs720Q E9 Rs8 Firmware Rs720Q E9 Rs8 S Firmware Z11Pa D8 Firmware Z11Pa D8C Firmware Rs720 E9 Rs24 U Firmware Rs720 E9 Rs8 G Firmware Rs500 E9 Ps4 Firmware Pro E800 G4 Firmware Rs500 E9 Rs4 Firmware Rs500 E9 Rs4 U Firmware Rs520 E9 Rs12 E Firmware Rs520 E9 Rs8 Firmware Esc8000 G4 Firmware Esc8000 G4 10G Firmware Rs720 E9 Rs12 E Firmware Ws C621E Sage Firmware Rs500A E10 Ps4 Firmware Rs500A E10 Rs4 Firmware Rs700A E9 Rs12V2 Firmware Rs700A E9 Rs4V2 Firmware Rs720A E9 Rs12V2 Firmware Rs720A E9 Rs24V2 Firmware Z11Pr D16 Firmware

4.9

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.9 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

CVE Published

Apr 06, 2021 - 05:15 nvd

MEDIUM 4.9

DescriptionNVD

The Firmware update function in ASUS BMC’s firmware Web management page does not verify the string length entered by users, resulting in a Buffer overflow vulnerability. As obtaining the privileged permission, remote attackers use the leakage to abnormally terminate the Web service.

AnalysisAI

The Firmware update function in ASUS BMC’s firmware Web management page does not verify the string length entered by users, resulting in a Buffer overflow vulnerability. Rated medium severity (CVSS 4.9), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. The Firmware update function in ASUS BMC’s firmware Web management page does not verify the string length entered by users, resulting in a Buffer overflow vulnerability. As obtaining the privileged permission, remote attackers use the leakage to abnormally terminate the Web service. Affected products include: Asus Asmb9-Ikvm Firmware, Asus Rs720A-E9-Rs24-E Firmware, Asus Rs700A-E9-Rs4 Firmware, Asus Rs700-E9-Rs4 Firmware, Asus Esc4000 G4X Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.