What is the CVSS score of CVE-2021-47764?

CVE-2021-47764 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Absolutetelnet are affected by CVE-2021-47764?

Organizations using AbsoluteTelnet 11.24 should be aware of moderate risk from CVE-2021-47764, a out-of-bounds write vulnerability rated CVSS 5.5.

Is there a public PoC exploit available for CVE-2021-47764?

Yes, a public proof-of-concept exploit is available for CVE-2021-47764. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47764?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Absolutetelnet CVE-2021-47764

MEDIUM

Out-of-bounds Write (CWE-787)

2026-01-15 disclosure@vulncheck.com

Denial Of Service Absolutetelnet Celestialsoftware

5.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 26, 2026 - 16:15 vuln.today

Public exploit code

CVE Published

Jan 15, 2026 - 16:16 nvd

MEDIUM 5.5

DescriptionCVE.org

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.

AnalysisAI

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. [CVSS 5.5 MEDIUM]

Technical ContextAI

Classified as CWE-787 (Out-of-bounds Write). Affects Absolutetelnet. 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.