CVE-2021-21723

Name: CVE-2021-21723
Creator: NVD / NIST
Published: 2021-01-26T18:16:18.803+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.19%

Last modified Jun 17, 2026

CVE-2021-21723 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Some ZTE products have a DoS vulnerability. Due to the improper handling of memory release in some specific scenarios, a remote attacker can trigger the vulnerability by performing a series of operations, resulting in memory leak, which may eventually lead to device denial of service. EPSS estimates a 1.19% chance of exploitation in the next 30 days.

Description

Some ZTE products have a DoS vulnerability. Due to the improper handling of memory release in some specific scenarios, a remote attacker can trigger the vulnerability by performing a series of operations, resulting in memory leak, which may eventually lead to device denial of service. This affects: ZXR10 9904, ZXR10 9908, ZXR10 9916, ZXR10 9904-S, ZXR10 9908-S; all versions up to V1.01.10.B12.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.19%

64.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-401

Affected Software

Vendor	Product	Versions
Zte	Zxr10 9904 Firmware	<= v1.01.10.b12
Zte	Zxr10 9908 Firmware	<= v1.01.10.b12
Zte	Zxr10 9916 Firmware	<= v1.01.10.b12
Zte	Zxr10 9904-S Firmware	<= v1.01.10.b12
Zte	Zxr10 9908-S Firmware	<= v1.01.10.b12

References

http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014424Vendor Advisory
http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014424Vendor Advisory

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21723?

How severe is CVE-2021-21723?

CVE-2021-21723 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.19% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21723?

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-2021-21723?

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

Scan your code now

Source: NVD / NIST