CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2023-42818
Critical (9.8) in fit2cloud jumpserver. EPSS 0.7% chance of exploitation in the next 30 days. Fixed in github.com/jumpserver/jumpserver 3.5.6+incompatible, 3.6.5+incompatible.
JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue.
Severity
- EPSS
- 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-307, CWE-287
- Published
- Modified
- Record from
- the NVD, synced
Affected
- fit2cloud:jumpserver
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GO-2025-3570 | Go | github.com/jumpserver/koko | all versions | no fix published |
| GO-2025-3570 | Go | github.com/jumpserver/jumpserver | <3.5.6+incompatible >=3.6.0+incompatible <3.6.5+incompatible | 3.5.6+incompatible, 3.6.5+incompatible |