What is CVE-2021-47765?

CVE-2021-47765 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-2021-47765?

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

Buffer overflow in Celestialsoftware Absolutetelnet

CVE-2021-47765

AbsoluteTelnet 11.24 contains a denial of service vulnerability that allows local attackers to crash the application by manipulating username and error report fields. Attackers can trigger the crash by inserting 1000 characters into the us…

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-2021-47765?: CVE-2021-47765 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-2021-47765?: Medium severity. CVSS v3 base score is 5.5 out of 10.