CVE-2021-21734

6.5 MEDIUM 0.5% exploit odds Fix listed

What it is

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

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. High risk of data exposure.
Exploit odds: 0.5% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-05-28 12:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:36 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.5% in the next 30 days (EPSS).
Severity: 6.5 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-05-28 12:15 UTC
Last modified: 2026-06-17 03:36 UTC
Exploit probability: 0.5% · EPSS, next 30 days
Weakness: CWE-312
Record status: Modified

Affected

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

Attack profile CVSS 3.1 · 6.5

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Raw vector

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

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2021-21734.md and follow it. Check whether this project is affected by CVE-2021-21734. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record