What is CVE-2021-47764?

CVE-2021-47764 is a medium-severity vulnerability in Celestialsoftware Absolutetelnet, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2026-01-15.

How severe is CVE-2021-47764?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Celestialsoftware Absolutetelnet

CVE-2021-47764

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 in…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (7.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Celestialsoftware Absolutetelnet — versions 11.24

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

disclosure@vulncheck.com (Exploit, Third Party Advisory, exploit)
disclosure@vulncheck.com (Product, product)

Frequently asked questions

What is CVE-2021-47764?: CVE-2021-47764 is a medium-severity vulnerability in Celestialsoftware Absolutetelnet, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2026-01-15.
How severe is CVE-2021-47764?: Medium severity. CVSS v3 base score is 5.5 out of 10.