AbsoluteTelnet 11.12 contains a denial of service vulnerability in the SSH2 username input field that allows local attackers to crash the application. Attackers can overwrite the username field with a 1000-byte buffer, causing the application to become unresponsive and terminate.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00005.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Celestial Software AbsoluteTelnet affected
Version Status Constraints
11.12 affected —

Configuration 1 [-]

cpe:2.3:a:celestialsoftware:absolutetelnet:11.12:*:*:*:*:*:*:*

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.celestialsoftware.net/ cve-icon cve-icon
https://www.exploit-db.com/exploits/48010 cve-icon cve-icon
https://www.vulncheck.com/advisories/absolutetelnet-sshusername-denial-of-service cve-icon cve-icon
History

Thu, 19 Feb 2026 19:00:00 +0000

Type Values Removed Values Added
First Time appeared Celestialsoftware
Celestialsoftware absolutetelnet
CPEs cpe:2.3:a:celestialsoftware:absolutetelnet:11.12:*:*:*:*:*:*:*
Vendors & Products Celestialsoftware
Celestialsoftware absolutetelnet

Tue, 17 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 10 Feb 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 09 Feb 2026 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Celestial Software
Celestial Software absolutetelnet
Vendors & Products Celestial Software
Celestial Software absolutetelnet

Fri, 06 Feb 2026 23:30:00 +0000

Type Values Removed Values Added
Description AbsoluteTelnet 11.12 contains a denial of service vulnerability in the SSH2 username input field that allows local attackers to crash the application. Attackers can overwrite the username field with a 1000-byte buffer, causing the application to become unresponsive and terminate.
Title AbsoluteTelnet 11.12 - 'SSH2/username' Denial of Service
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-02-17T16:54:51.820Z

Reserved: 2026-02-06T12:29:50.763Z

Link: CVE-2020-37166

cve-icon Vulnrichment

Updated: 2026-02-10T20:33:49.047Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-07T00:15:57.117

Modified: 2026-02-19T18:52:13.997

Link: CVE-2020-37166

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-09T10:45:16Z

Weaknesses