Auth bypass in ZTE R5300g4

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>

Vulnerability class: Broken Authentication

EPSS: 0.019 (77.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

  • Zte R5300g4
  • Zte R5300g4_firmware — versions 03.04.0020, 03.05.0040, 03.05.0043
  • Zte R5500g4
  • Zte R5500g4_firmware — versions 03.06.0100, 03.07.0100, 03.07.0200
  • Zte R8500g4
  • Zte R8500g4_firmware — versions 03.05.0020, 03.05.0400, 03.06.0100
  • N/a <r5300g4?r8500g4?r5500g4> — versions <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>.

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-6871?
CVE-2020-6871 is a critical-severity vulnerability in ZTE R5300g4, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-07-20.
How severe is CVE-2020-6871?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-6871 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.