How severe is CVE-2020-6871?

CVE-2020-6871 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-6871 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-6871?

CVE-2020-6871 primarily affects Zte R8500g4 Firmware. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-6871?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-6871 published?

CVE-2020-6871 was published on 2020-07-20 and last updated on 2026-06-17.

CVE-2020-6871

CVE-2020-6871 is a critical-severity vulnerability in Zte R8500g4 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Zte R8500g4 Firmware
Published: 2020-07-20
Last modified: 2026-06-17

Description

The server management software module of ZTE has an authentication issue vulnerability, which allows users to skip the authentication of the server and execute some commands for high-level users. This affects: <R5300G4V03.08.0100/V03.07.0300/V03.07.0200/V03.07.0108/V03.07.0100/V03.05.0047/V03.05.0046/V03.05.0045/V03.05.0044/V03.05.0043/V03.05.0040/V03.04.0020;R8500G4V03.07.0103/V03.07.0101/V03.06.0100/V03.05.0400/V03.05.0020;R5500G4V03.08.0100/V03.07.0200/V03.07.0100/V03.06.0100>

Frequently asked questions

What is CVE-2020-6871?: The server management software module of ZTE has an authentication issue vulnerability, which allows users to skip the authentication of the server and execute some commands for high-level users. This affects: <R5300G4V03.08.0100/V03.07.0300/V03.07.0200/V03.07.0108/V03.07.0100/V03.05.0047/V03.05.0046/V03.05.0045/V03.05.0044/V03.05.0043/V03.05.0040/V03.04.0020;R8500G4V03.07.0103/V03.07.0101/V03.06.0100/V03.05.0400/V03.05.0020;R5500G4V03.08.0100/V03.07.0200/V03.07.0100/V03.06.0100>
How severe is CVE-2020-6871?: CVE-2020-6871 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-6871 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-6871?: CVE-2020-6871 primarily affects Zte R8500g4 Firmware. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-6871?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-6871 published?: CVE-2020-6871 was published on 2020-07-20 and last updated on 2026-06-17.

References

http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1013203

Affected products (21)

cpe:2.3:o:zte:r8500g4_firmware:03.05.0020:*:*:*:*:*:*:*
cpe:2.3:o:zte:r8500g4_firmware:03.05.0400:*:*:*:*:*:*:*
cpe:2.3:o:zte:r8500g4_firmware:03.06.0100:*:*:*:*:*:*:*
cpe:2.3:o:zte:r8500g4_firmware:03.07.0101:*:*:*:*:*:*:*
cpe:2.3:o:zte:r8500g4_firmware:03.07.0103:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5500g4_firmware:03.06.0100:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5500g4_firmware:03.07.0100:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5500g4_firmware:03.07.0200:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5500g4_firmware:03.08.0100:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.04.0020:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.05.0040:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.05.0043:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.05.0044:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.05.0045:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.05.0046:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.05.0047:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.07.0100:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.07.0108:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.07.0200:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.07.0300:*:*:*:*:*:*:*
cpe:2.3:o:zte:r5300g4_firmware:03.08.0100:*:*:*:*:*:*:*

More vulnerabilities in Zte R8500g4 Firmware

CVE-2020-6872 — Medium (CVSS 6.1): The server management software module of ZTE has a storage XSS vulnerability. The attacker inserts some attack codes…

All CVEs affecting Zte R8500g4 Firmware →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-101077 — Critical (CVSS 10.0): A flaw has been found in Netcore NR289-GE 1.4.5102. This impacts the function process_request of the component boa_temp…
CVE-2026-100886 — Critical (CVSS 10.0): A vulnerability was identified in Seetong T8108, T8108P, T8116 and T8232 4.6.1.4-build202604241011. The affected…
CVE-2026-77244 — Critical (CVSS 10.0): MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0,…
CVE-2026-94493 — Critical (CVSS 10.0): A vulnerability was detected in Gigatech PDV5701 1.0.31_240305_112640. This issue affects some unknown processing of…
CVE-2026-83099 — Critical (CVSS 10.0): Vulnerability in the Oracle Forms product of Oracle Fusion Middleware (component: Forms Services, C/S, Charmode).…
CVE-2026-83059 — Critical (CVSS 10.0): Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server).…

Browse all CWE-287 (Improper Authentication) vulnerabilities →