What is CVE-2021-21739?

CVE-2021-21739 is a medium-severity vulnerability in Zte Zxctn 6120h, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.6/10. Published 2021-08-05.

How severe is CVE-2021-21739?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Vulnerability in Zte Zxctn 6120h

CVE-2021-21739

A ZTE's product of the transport network access layer has a security vulnerability. Because the system does not sufficiently verify the data reliability, attackers could replace an authenticated optical module on the equipment with an unauthenticated one, bypassing system authentication and detection, thus affecting signal transmission. This affects: <ZXCTN 6120H><V5.10.00B24>

EPSS: 0.002 (16.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Zte Zxctn_6120h
Zte Zxctn_6120h_firmware — versions 5.10.00b24
N/a <zxctn 6120h> — versions <V5.10.00B24>

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

psirt@zte.com.cn (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-21739?: CVE-2021-21739 is a medium-severity vulnerability in Zte Zxctn 6120h, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.6/10. Published 2021-08-05.
How severe is CVE-2021-21739?: Medium severity. CVSS v3 base score is 4.6 out of 10.