9.1

CVE-2023-43652: Non-MFA account takeover via using only SSH public key to login in jumpserver

Analyzed
Published 27-09-2023Last modified 25-03-2025

Vulnerability summary

CVE-2023-43652 is a critical (CVSS 9.1) Missing Authorization vulnerability in fit2cloud jumpserver. EPSS estimates a 0.81% chance of exploitation in the next 30 days, higher than 57% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.1 (NVD)
EPSS score
0.81%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Timeline

  1. 27-09-2023
    PublishedVulnerability first disclosed.
  2. 25-03-2025
    Last modifiedVulnerability information updated.

Description

JumpServer is an open source bastion host. As an unauthenticated user, it is possible to authenticate to the core API with a username and an SSH public key without needing a password or the corresponding SSH private key. An SSH public key should be considered public knowledge and should not used as an authentication secret alone. JumpServer provides an API for the KoKo component to validate user private key logins. This API does not verify the source of requests and will generate a personal authentication token. Given that public keys can be easily leaked, an attacker can exploit the leaked public key and username to authenticate, subsequently gaining access to the current user's information and authorized actions. This issue has been addressed in versions 2.28.20 and 3.7.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.81%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.81% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Jumpserver

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Fit2cloud1 product
  • jumpserver≥ 2.0.0, < 2.28.20 | ≥ 3.0.0, < 3.7.1
Jumpserver1 product
  • jumpserver≥ 2.0.0, < 2.28.20 | ≥ 3.0.0, < 3.7.1

2 vendors · 2 products

References

2 links