What is the CVSS score of CVE-2021-21749?

CVE-2021-21749 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.6%.

Mf971R Firmware CVE-2021-21749

CRITICAL

Out-of-bounds Write (CWE-787)

2021-10-20 psirt@zte.com.cn

Buffer Overflow Zte Memory Corruption RCE Mf971R Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Oct 20, 2021 - 16:15 nvd

CRITICAL 9.8

DescriptionNVD

ZTE MF971R product has two stack-based buffer overflow vulnerabilities. An attacker could exploit the vulnerabilities to execute arbitrary code.

AnalysisAI

ZTE MF971R product has two stack-based buffer overflow vulnerabilities. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. ZTE MF971R product has two stack-based buffer overflow vulnerabilities. An attacker could exploit the vulnerabilities to execute arbitrary code. Affected products include: Zte Mf971R Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).