CVE-2021-47764 - CVE House

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Status published Medium CVE-2021-47764

AbsoluteTelnet 11.24 - 'Phone' Denial of Service (PoC)

6.7 CVSS

Vulnerability Description

AbsoluteTelnet 11.24 contains a denial of service vulnerability that allows local attackers to crash the application by manipulating DialUp connection and license name fields. Attackers can generate a 1000-character payload and paste it into specific input fields to trigger application crashes and force unexpected termination.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Yehia Elghaly

References

More from Celestialsoftware

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AbsoluteTelnet 11.24 - 'Username' Denial of Service (PoC)

Affected Vendor

Celestialsoftware

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Affected Software

AbsoluteTelnet

Vulnerable Versions:

11.24

Timeline

Official Publish: January 15th, 2026

Last Modified: February 18th, 2026

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1068 Exploitation for Privilege Escalation

Privilege Escalation

T1055 Process Injection

Defense Evasion

T1105 Ingress Tool Transfer

Command and Control

T1485 Data Destruction