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Vulnerability record · CVE-2021-21743 · published 20 October 2021

CVE-2021-21743: Zte mf971r firmware injection vulnerability

Zte · Mf971r Firmware

ZTE MF971R product has a CRLF injection vulnerability. An attacker could exploit the vulnerability to modify the HTTP response header information through a specially crafted HTTP request.

4.3 CVSS 3.1 Medium EPSS 0.85% · top 43.5% CWE-74 · Injection
4.3CVSS 3.1 base score, v2 4.3
0.85%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 a CRLF injection vulnerability. An attacker could exploit the vulnerability to modify the HTTP response header information through a specially crafted HTTP request.

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

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-2021-21748Zte 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 1.8%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-2021-21745ZTE 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%analysed10.0CVE-2025-20337Cisco ISE API input validation flaw allows unauthenticated root RCECisco ISE and ISE-PIC fail to properly validate user-supplied input in a specific API, letting an unauthenticated remote attacker execute arbitrary c…KEVEPSS 68%analysed10.0CVE-2025-20281Cisco ISE API unauthenticated remote code executionCisco ISE and ISE-PIC fail to properly validate user-supplied input in a specific API, allowing a crafted request to reach the underlying operating s…KEVEPSS 98%analysed

Source: NIST National Vulnerability Database (record CVE-2021-21743), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.