How severe is CVE-2021-21745?

CVE-2021-21745 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-21745 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 56% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21745?

CVE-2021-21745 primarily affects Zte Mf971r Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21745?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21745 published?

CVE-2021-21745 was published on 2021-10-20 and last updated on 2026-06-17.

CVE-2021-21745

CVE-2021-21745 is a medium-severity vulnerability in Zte Mf971r Firmware with a CVSS 3.x base score of 4.3. Its EPSS exploit-prediction score of 56% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-352.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 56% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Zte Mf971r Firmware
Published: 2021-10-20
Last modified: 2026-06-17

Description

ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould use this vulnerability to perform illegal authorization operations by sending a request to the user to click.

Frequently asked questions

What is CVE-2021-21745?: ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould use this vulnerability to perform illegal authorization operations by sending a request to the user to click.
How severe is CVE-2021-21745?: CVE-2021-21745 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-21745 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 56% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21745?: CVE-2021-21745 primarily affects Zte Mf971r Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21745?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21745 published?: CVE-2021-21745 was published on 2021-10-20 and last updated on 2026-06-17.

References

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

Affected products (5)

cpe:2.3:o:zte:mf971r_firmware:v1.0.0b05:*:*:*:*:*:*:*
cpe:2.3:o:zte:mf971r_firmware:1v1.0.0b06:*:*:*:*:*:*:*
cpe:2.3:o:zte:mf971r_firmware:2v1.0.0b03:*:*:*:*:*:*:*
cpe:2.3:o:zte:mf971r_firmware:s2v1.0.0b03:*:*:*:*:*:*:*
cpe:2.3:o:zte:mf971r_firmware:sv1.0.0b05:*:*:*:*:*:*:*

More vulnerabilities in Zte Mf971r Firmware

CVE-2021-21749 — Critical (CVSS 9.8): ZTE MF971R product has two stack-based buffer overflow vulnerabilities. An attacker could exploit the vulnerabilities…
CVE-2021-21748 — Critical (CVSS 9.8): ZTE MF971R product has two stack-based buffer overflow vulnerabilities. An attacker could exploit the vulnerabilities…
CVE-2021-21744 — High (CVSS 7.5): ZTE MF971R product has a configuration file control vulnerability. An attacker could use this vulnerability to modify…
CVE-2021-21747 — Medium (CVSS 6.1): ZTE MF971R product has reflective XSS vulnerability. An attacker could use the vulnerability to obtain cookie…
CVE-2021-21746 — Medium (CVSS 6.1): ZTE MF971R product has reflective XSS vulnerability. An attacker could use the vulnerability to obtain cookie…
CVE-2021-21743 — Medium (CVSS 4.3): ZTE MF971R product has a CRLF injection vulnerability. An attacker could exploit the vulnerability to modify the HTTP…

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