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 into specific input fields to trigger application crashes and force unexpected termination.
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/50511 (Exploit, Third Party Advisory, exploit)
- www.celestialsoftware.net/ (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.