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Vulnerability record · CVE-2021-21748 · published 20 October 2021

CVE-2021-21748: Zte mf971r firmware out-of-bounds write vulnerability

Zte · Mf971r Firmware

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

9.8 CVSS 3.1 Critical EPSS 1.8% · top 22.7% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1019764 Vendor Advisory
https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1019764 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-21749Zte mf971r firmware out-of-bounds write vulnerabilityZTE MF971R product has two stack-based buffer overflow vulnerabilities. An attacker could exploit the vulnerabilities to execute arbitrary code.EPSS 1.6%7.5CVE-2021-21744Zte mf971r firmware vulnerabilityZTE MF971R product has a configuration file control vulnerability. An attacker could use this vulnerability to modify the configuration parameters of…EPSS 0.83%6.1CVE-2021-21746Zte mf971r firmware cross-site scripting vulnerabilityZTE MF971R product has reflective XSS vulnerability. An attacker could use the vulnerability to obtain cookie information.EPSS 0.58%6.1CVE-2021-21747Zte mf971r firmware cross-site scripting vulnerabilityZTE MF971R product has reflective XSS vulnerability. An attacker could use the vulnerability to obtain cookie information.EPSS 0.58%4.3CVE-2021-21743Zte mf971r firmware injection vulnerabilityZTE MF971R product has a CRLF injection vulnerability. An attacker could exploit the vulnerability to modify the HTTP response header information thr…EPSS 0.85%4.3CVE-2021-21745ZTE MF971R Referer authentication bypass via missing CSRF checkThe ZTE MF971R router trusts the Referer header for authorization decisions and does not verify CSRF tokens, so a crafted request can bypass authenti…EPSS 56%analysed8.8CVE-2026-53266Linux kernel ebtables SNAT out-of-bounds write in ARP rewriteThe ebtables SNAT target rewrites the ARP sender hardware address via skb_store_bits() without first making that range writable. When the ARP SHA byt…KEVEPSS 0.65%analysed8.8CVE-2026-87491Google Chrome V8 out-of-bounds write enables sandbox code executionChrome before 153.0.8010.36 contains an out-of-bounds write in the V8 JavaScript engine. A crafted HTML page can trigger the memory corruption, and b…KEVEPSS 3.1%analysed

Source: NIST National Vulnerability Database (record CVE-2021-21748), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.