CVE-2020-37166

AbsoluteTelnet 11.12 - 'SSH2/username' Denial of Service

CVSS 6.9 MEDIUMEPSS 0.2%CWE-120

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.9EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

06 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

Celestial Software · AbsoluteTelnet

References

https://www.celestialsoftware.net/https://www.exploit-db.com/exploits/48010 https://www.vulncheck.com/advisories/absolutetelnet-sshusername-denial-of-service