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 username or email address fields, causing the application to become unresponsive.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (8.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Celestialsoftware Absolutetelnet — versions 11.24
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/50510 (Exploit, Third Party Advisory, exploit)
- www.celestialsoftware.net/ (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.