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6.7

AbsoluteTelnet can crash when a long license name is entered

CVE-2020-37164 · published 9 months ago
Summary

A user who can access the program locally can cause AbsoluteTelnet to stop working by entering a very long text (about 2,500 characters) in the license name field. The program will crash, interrupting any remote connections that rely on it. Avoid pasting long strings and apply any available updates that limit the length of the license entry.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
celestialsoftware absolutetelnet <= 11.12
cpe:2.3:a:celestialsoftware:absolutetelnet:*:*:*:*:*:*:*:*
celestial software absolutetelnet 11.12
Original advisory text
AbsoluteTelnet 11.12 - "license entry" Denial of Service
AbsoluteTelnet 11.12 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an oversized license name. Attackers can generate a 2500-character payload and paste it into the license entry field to trigger an application crash.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
6.7 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-120Classic Buffer Overflow
Timeline
Published6 Feb 2026
Updated2 Nov 2026
First seen6 Mar 2026
Sources
CVE-2020-37164 · NVD
CVE-2020-37164 · MITRE
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