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TI-2023-22909 Aliases CVE-2023-42818

SSH public key login without private key challenge if mfa is enabled in jumpserver

Priority HIGH 75CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00675 52nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed jumpserver (jumpserver): 3.6.5, 3.5.6

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

VendorProductAffected versionsFixed inStatusSource
jumpserverjumpserver3.6.0 to before 3.6.5; before 3.5.63.6.5, 3.5.6Patch availableCNA
  • jumpserver Vendorjumpserver Affected 3.6.0 to before 3.6.5; before 3.5.6 Fixed in 3.6.5, 3.5.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*before 3.5.6; 3.6.0 to before 3.6.5Vulnerable1Panel-dev
  • cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:* Versions before 3.5.6; 3.6.0 to before 3.6.5 Vulnerable ·1Panel-dev

Remediation

  • Fix · CNA jumpserver (jumpserver) Fixed in 3.6.5, 3.5.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-42818

References

Exploit 1

Other 1

  • TI-2024-27040 Arbitrary File Read in Ansible Playbooks in Jumpserver CVSS 3.1CRITICAL 10.0
  • TI-2023-23378 Non-MFA account takeover via using only SSH public key to login in jumpserver CVSS 3.1CRITICAL 9.1
  • TI-2023-22607 JumpServer session replays download without authentication CVSS 3.1HIGH 8.2
  • TI-2024-27041 Arbitrary File Write in Ansible Playbooks leads to RCE in Jumpserver CVSS 3.1CRITICAL 10.0
  • TI-2024-19371 JumpServer vulnerable to Jinja2 template injection in Ansible leads to RCE in Celery CVSS 3.1CRITICAL 10.0
  • TI-2024-19370 JumpServer's insecure Ansible playbook validation leads to RCE in Celery CVSS 3.1CRITICAL 10.0
See all 27 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences