How severe is CVE-2021-21734?

CVE-2021-21734 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-2021-21734 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21734?

CVE-2021-21734 primarily affects Zte Zxa10 F821 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21734?

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

When was CVE-2021-21734 published?

CVE-2021-21734 was published on 2021-05-28 and last updated on 2026-06-17.

CVE-2021-21734

CVE-2021-21734 is a medium-severity vulnerability in Zte Zxa10 F821 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-312.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-312
Affected product: Zte Zxa10 F821 Firmware
Published: 2021-05-28
Last modified: 2026-06-17

Description

Some PON MDU devices of ZTE stored sensitive information in plaintext, and users with login authority can obtain it by inputing command. This affects: ZTE PON MDU device ZXA10 F821 V1.7.0P3T22, ZXA10 F822 V1.4.3T6, ZXA10 F819 V1.2.1T5, ZXA10 F832 V1.1.1T7, ZXA10 F839 V1.1.0T8, ZXA10 F809 V3.2.1T1, ZXA10 F822P V1.1.1T7, ZXA10 F832 V2.00.00.01

Frequently asked questions

What is CVE-2021-21734?: Some PON MDU devices of ZTE stored sensitive information in plaintext, and users with login authority can obtain it by inputing command. This affects: ZTE PON MDU device ZXA10 F821 V1.7.0P3T22, ZXA10 F822 V1.4.3T6, ZXA10 F819 V1.2.1T5, ZXA10 F832 V1.1.1T7, ZXA10 F839 V1.1.0T8, ZXA10 F809 V3.2.1T1, ZXA10 F822P V1.1.1T7, ZXA10 F832 V2.00.00.01
How severe is CVE-2021-21734?: CVE-2021-21734 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-2021-21734 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21734?: CVE-2021-21734 primarily affects Zte Zxa10 F821 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21734?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21734 published?: CVE-2021-21734 was published on 2021-05-28 and last updated on 2026-06-17.

References

https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1015524

Affected products (8)

cpe:2.3:o:zte:zxa10_f821_firmware:1.7.0p3t22:*:*:*:*:*:*:*
cpe:2.3:o:zte:zxa10_f822_firmware:1.4.3t6:*:*:*:*:*:*:*
cpe:2.3:o:zte:zxa10_f819_firmware:1.2.1t5:*:*:*:*:*:*:*
cpe:2.3:o:zte:zxa10_f832_firmware:1.1.1t7:*:*:*:*:*:*:*
cpe:2.3:o:zte:zxa10_f839_firmware:1.1.0t8:*:*:*:*:*:*:*
cpe:2.3:o:zte:zxa10_f809_firmware:3.2.1t1:*:*:*:*:*:*:*
cpe:2.3:o:zte:zxa10_f822p_firmware:1.1.1t7:*:*:*:*:*:*:*
cpe:2.3:o:zte:zxa10_f832v2_firmware:2.00.00.01:*:*:*:*:*:*:*

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