How severe is CVE-2020-6870?

CVE-2020-6870 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-6870 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-6870?

CVE-2020-6870 affects Zte Netnumen U31 R10 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-6870?

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

When was CVE-2020-6870 published?

CVE-2020-6870 was published on 2020-06-24 and last updated on 2026-06-17.

CVE-2020-6870

CVE-2020-6870 is a high-severity vulnerability in Zte Netnumen U31 R10 Firmware with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.0)
CVSS v2: 5.2
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zte Netnumen U31 R10 Firmware
Published: 2020-06-24
Last modified: 2026-06-17

Description

The version V12.17.20T115 of ZTE U31R20 product is impacted by a design error vulnerability. An attacker could exploit the vulnerability to log in to the FTP server to tamper with the password, and illegally download, modify, upload, or delete files, causing improper operation of the network management system and equipment. This affects: NetNumenU31R20 V12.17.20T115

Frequently asked questions

What is CVE-2020-6870?: The version V12.17.20T115 of ZTE U31R20 product is impacted by a design error vulnerability. An attacker could exploit the vulnerability to log in to the FTP server to tamper with the password, and illegally download, modify, upload, or delete files, causing improper operation of the network management system and equipment. This affects: NetNumenU31R20 V12.17.20T115
How severe is CVE-2020-6870?: CVE-2020-6870 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-6870 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-6870?: CVE-2020-6870 affects Zte Netnumen U31 R10 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-6870?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-6870 published?: CVE-2020-6870 was published on 2020-06-24 and last updated on 2026-06-17.

References

http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1013043

Affected products (1)

cpe:2.3:o:zte:netnumen_u31_r10_firmware:v12.17.20t115:*:*:*:*:*:*:*