CVE-2020-6881

Name: CVE-2020-6881
Creator: NVD / NIST
Published: 2020-12-21T18:15:16.713+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2020-6881 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. ZTE E8810/E8820/E8822 series routers have an MQTT DoS vulnerability, which is caused by the failure of the device to verify the validity of abnormal messages. A remote attacker could connect to the MQTT server and send an MQTT exception message to the specified device, which will cause the device to deny service. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

ZTE E8810/E8820/E8822 series routers have an MQTT DoS vulnerability, which is caused by the failure of the device to verify the validity of abnormal messages. A remote attacker could connect to the MQTT server and send an MQTT exception message to the specified device, which will cause the device to deny service. This affects:<ZXHN E8810, ZXHN E8820, ZXHN E8822><E8810 V1.0.26, E8810 V2.0.1, E8820 V1.1.3L, E8820 V2.0.13, E8822 V2.0.13>

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

0.58%

43.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-346

Affected Software

Vendor	Product	Versions
Zte	Zxhn E8810 Firmware	1.0.26
Zte	Zxhn E8810 Firmware	2.0.1
Zte	Zxhn E8820 Firmware	1.1.3
Zte	Zxhn E8820 Firmware	2.0.13
Zte	Zxhn E8822 Firmware	2.0.13

References

http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014202Vendor Advisory
http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014202Vendor Advisory

Timeline

Published: Dec 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6881?

How severe is CVE-2020-6881?

CVE-2020-6881 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6881?

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-2020-6881?

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

Scan your code now

Source: NVD / NIST