How severe is CVE-2021-21730?

CVE-2021-21730 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21730 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21730?

CVE-2021-21730 affects Zte Zxhn H168n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21730?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-21730 published?

CVE-2021-21730 was published on 2021-04-13 and last updated on 2026-06-17.

CVE-2021-21730

CVE-2021-21730 is a critical-severity vulnerability in Zte Zxhn H168n Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zte Zxhn H168n Firmware
Published: 2021-04-13
Last modified: 2026-06-17

Description

A ZTE product is impacted by improper access control vulnerability. The attacker could exploit this vulnerability to access CLI by brute force attacks.This affects: ZXHN H168N V3.5.0_TY.T6

Frequently asked questions

What is CVE-2021-21730?: A ZTE product is impacted by improper access control vulnerability. The attacker could exploit this vulnerability to access CLI by brute force attacks.This affects: ZXHN H168N V3.5.0_TY.T6
How severe is CVE-2021-21730?: CVE-2021-21730 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21730 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21730?: CVE-2021-21730 affects Zte Zxhn H168n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21730?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-21730 published?: CVE-2021-21730 was published on 2021-04-13 and last updated on 2026-06-17.

References

https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014864

Affected products (1)

cpe:2.3:o:zte:zxhn_h168n_firmware:3.5.0_ty.t6:*:*:*:*:*:*:*

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