How severe is CVE-2021-21735?

CVE-2021-21735 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-21735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21735?

CVE-2021-21735 affects Zte Zxhn H168n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21735?

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

When was CVE-2021-21735 published?

CVE-2021-21735 was published on 2021-06-10 and last updated on 2026-06-17.

CVE-2021-21735

CVE-2021-21735 is a medium-severity vulnerability in Zte Zxhn H168n Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-281.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-281
Affected product: Zte Zxhn H168n Firmware
Published: 2021-06-10
Last modified: 2026-06-17

Description

A ZTE product has an information leak vulnerability. Due to improper permission settings, an attacker with ordinary user permissions could exploit this vulnerability to obtain some sensitive user information through the wizard page without authentication. This affects ZXHN H168N all versions up to V3.5.0_EG1T4_TE.

Frequently asked questions

What is CVE-2021-21735?: A ZTE product has an information leak vulnerability. Due to improper permission settings, an attacker with ordinary user permissions could exploit this vulnerability to obtain some sensitive user information through the wizard page without authentication. This affects ZXHN H168N all versions up to V3.5.0_EG1T4_TE.
How severe is CVE-2021-21735?: CVE-2021-21735 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-21735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21735?: CVE-2021-21735 affects Zte Zxhn H168n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21735 published?: CVE-2021-21735 was published on 2021-06-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:zte:zxhn_h168n_firmware:*:*:*:*:*:*:*:*

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