AbsoluteTelnet 11.12 - 'SSH2/username' Denial of Service
Published Feb 6, 2026
6.9
MEDIUMCVSS 4.0
EPSS 0.23%
Description
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.
Affected products
-
- Version 11.12StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Celestial Software | AbsoluteTelnet | n/a |
|
- 11.12
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Feb 17, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Feb–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.23% (0.00227) | 12.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.21% (0.00213) | 11.53th | v5 (v2026.06.15) |
| Feb 7, 2026 | 0.01% (0.00012) | 1.37th | v4 (v2025.03.14) |
References (3)
- https://www.celestialsoftware.net/ product
- https://www.exploit-db.com/exploits/48010 exploitThird Party AdvisoryVDB Entry
- https://www.vulncheck.com/advisories/absolutetelnet-sshusername-denial-of-service third-party-advisoryBroken Link
| Link | Providers | Tags |
|---|---|---|
| https://www.celestialsoftware.net/ | product | |
| https://www.exploit-db.com/exploits/48010 | exploitThird Party AdvisoryVDB Entry | |
| https://www.vulncheck.com/advisories/absolutetelnet-sshusername-denial-of-service | third-party-advisoryBroken Link |
Change history (0)
No recorded changes yet.