CVE-2021-21734

Name: CVE-2021-21734
Creator: NVD / NIST
Published: 2021-05-28T12:15:07.603+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2021-21734 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.51%

39.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-312

Affected Software

Vendor	Product	Versions
Zte	Zxa10 F821 Firmware	1.7.0p3t22
Zte	Zxa10 F822 Firmware	1.4.3t6
Zte	Zxa10 F819 Firmware	1.2.1t5
Zte	Zxa10 F832 Firmware	1.1.1t7
Zte	Zxa10 F839 Firmware	1.1.0t8
Zte	Zxa10 F809 Firmware	3.2.1t1
Zte	Zxa10 F822p Firmware	1.1.1t7
Zte	Zxa10 F832v2 Firmware	2.00.00.01

References

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

Timeline

Published: May 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21734?

How severe is CVE-2021-21734?

CVE-2021-21734 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21734?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21734?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST