AbsoluteTelnet 11.12 - 'SSH2/username' Denial of Service
Priority MEDIUM 64CWE-120Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
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 application to become unresponsive and terminate.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00237 14th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Celestial Software | AbsoluteTelnet | 11.12 | — | No fix listed | CNA |
- AbsoluteTelnet VendorCelestial Software Affected 11.12 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:celestialsoftware:absolutetelnet:11.12:*:*:*:*:*:*:* | 11.12 | Vulnerable | Celestialsoftware |
- cpe:2.3:a:celestialsoftware:absolutetelnet:11.12:*:*:*:*:*:*:* Versions 11.12 Vulnerable ·Celestialsoftware
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-37166
- 2026-10-03 Alias added: GHSA-vp6j-grx7-8jmx
References
Exploit 1
Other 1
More Celestial Software vulnerabilities
- TI-2020-19300 AbsoluteTelnet 11.12 - "license name" Denial of Service CVSS 4.0MEDIUM 6.7
- TI-2020-19299 AbsoluteTelnet 11.12 - "license entry" Denial of Service CVSS 4.0MEDIUM 6.7
- TI-2003-00994 Buffer overflow in AbsoluteTelnet before 2.12 RC10 allows remote attackers to execute… CVSS 2.0HIGH 10.0
- TI-2003-00042 AbsoluteTelnet SSH2 client does not clear logon credentials from memory, including… CVSS 2.0MEDIUM 4.6
Sources
- CVE-2020-37166 · CVE Program
- CVE-2020-37166 · NVD
- FIRST EPSS
- GHSA-vp6j-grx7-8jmx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences