---
id: CVE-2021-47764
title: AbsoluteTelnet 11.24 - 'Phone' Denial of Service (PoC)
summary: >-
  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 …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: Celestialsoftware
product: AbsoluteTelnet
affected:
  - AbsoluteTelnet 11.24
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-02-18T20:27:12.088965Z'
exploitAvailable: true
published: '2026-01-15'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T15:19:38.873Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2021-47764'
references:
  - url: 'https://www.exploit-db.com/exploits/50511'
    label: ExploitDB-50511
  - url: 'https://www.celestialsoftware.net/'
    label: Vendor Homepage
tags:
  - cve.org
  - exploit-available
epss: 0.00196
epssPercentile: 0.08434
ingestedAt: '2026-10-01T15:48:17.874Z'
---

## Overview

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.

## Affected

- `AbsoluteTelnet 11.24`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.