CVE-2023-42818: 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…

PriorityP261critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

0.58%

43.4th percentile

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.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
fit2cloud	jumpserver	< 3.5.6	3.5.6
fit2cloud	jumpserver	>= 3.6.0 < 3.6.5	3.6.5
github.com	jumpserver_jumpserver	>= 0 < 3.5.6+incompatible	3.5.6+incompatible
github.com	jumpserver_jumpserver	>= 3.6.0+incompatible < 3.6.5+incompatible	3.6.5+incompatible
jumpserver	jumpserver	< 3.5.6	3.5.6
jumpserver	jumpserver	—	—

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.