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CVE-2021-25309

CRITICAL
9.8
CVSS Score
Published: March 2, 2021 at 12:41 AM UTC
Updated: June 17, 2026 at 03:41 AM UTC
2 products affected across 1 vendorDX600A FirmwareDx600A

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Severity
CRITICAL9.8
Exploit prediction
EPSS 1%

Description

The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

DX600A Firmware· Gigaset
95%
41.00-175
gigaset-dx600a (same device)
Dx600A· Gigasetdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://research.nccgroup.com/2021/02/28/technical-advisory-administrative-passcode-recovery-and-authenticated-remote-buffer-overflow-vulnerabilities-in-gigaset-dx600a-handset-cve-2021-25309-cve-2021-25306/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-307CWE-521

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