What is CVE-2020-37166?

CVE-2020-37166 is a medium-severity vulnerability in Celestial Software Absolutetelnet, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.2/10. Published 2026-02-07.

How severe is CVE-2020-37166?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Buffer overflow in Celestial Software Absolutetelnet

CVE-2020-37166

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 applicat…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Celestial Software Absolutetelnet — versions 11.12
Celestialsoftware Absolutetelnet — versions 11.12

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

disclosure@vulncheck.com (Exploit, VDB Entry, Third Party Advisory, exploit)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (Broken Link, third-party-advisory)

Frequently asked questions

What is CVE-2020-37166?: CVE-2020-37166 is a medium-severity vulnerability in Celestial Software Absolutetelnet, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.2/10. Published 2026-02-07.
How severe is CVE-2020-37166?: Medium severity. CVSS v3 base score is 6.2 out of 10.