What is CVE-2021-21722?

CVE-2021-21722 is a medium-severity vulnerability in ZTE Zxv10 B860a, classified under Insertion of Sensitive Information into Log File. CVSS score: 4.4/10. Published 2021-01-14.

How severe is CVE-2021-21722?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Information disclosure in ZTE Zxv10 B860a

CVE-2021-21722

A ZTE Smart STB is impacted by an information leak vulnerability. The device did not fully verify the log, so attackers could use this vulnerability to obtain sensitive user information for further information detection and attacks. This affects: ZXV10 B860A V2.1-T_V0032.1.1.04_jiangsuTelecom.

Published 2021-01-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (30.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

ZTE Zxv10 B860a
ZTE Zxv10 B860a Firmware — versions v2.1-t_v0032.1.1.04_jiangsutelecom
Zxv10 B860a — versions V2.1-T_V0032.1.1.04_jiangsuTelecom

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

support.zte.com.cn/support/news/LoopholeInfoDetail.aspx (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21722?: CVE-2021-21722 is a medium-severity vulnerability in ZTE Zxv10 B860a, classified under Insertion of Sensitive Information into Log File. CVSS score: 4.4/10. Published 2021-01-14.
How severe is CVE-2021-21722?: Medium severity. CVSS v3 base score is 4.4 out of 10.