CVE-2023-43650

Auth Bypass in Fit2Cloud Jumpserver 2.0.0 – 2.28.20

Public PoCAuth Bypass

Published

27 September 2023

Modified

21 April 2025

Patch / advisory

View advisory

CVSS Score v3.1 8.2

Click a component to see what it means

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS Score 0.0060 48th percentile

Risk Priority 62 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-43650 is a high-severity Weak Password Recovery Mechanism for Forgotten Password (CWE-640) vulnerability in Fit2Cloud Jumpserver. Its CVSS base score is 8.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked at the 48th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2023-48042

Vulnerability Data

JumpServer is an open source bastion host. The verification code for resetting user's password is vulnerable to brute-force attacks due to the absence of rate limiting. JumpServer provides a feature allowing users to reset forgotten passwords. Affected users are sent…

a 6-digit verification code, ranging from 000000 to 999999, to facilitate the password reset. Although the code is only available in 1 minute, this window potentially allows for up to 1,000,000 validation attempts. 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.

CWE(s): CWE-640

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.001 Junk Data Command And Control

Adversaries may add junk data to protocols used for command and control to make detection more difficult.

attack.mitre.org →

T1003.003 NTDS Credential Access

Adversaries may attempt to access or create a copy of the Active Directory domain database in order to steal credential information, as well as obtain other information about domain members such as devices, users, and access rights.

attack.mitre.org →

T1003.006 DCSync Credential Access

Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…

attack.mitre.org →

T1003.007 Proc Filesystem Credential Access

Adversaries may gather credentials from the proc filesystem or `/proc`.

attack.mitre.org →

T1010 Application Window Discovery Discovery

Adversaries may attempt to get a listing of open application windows.

attack.mitre.org →

T1016 System Network Configuration Discovery Discovery

Adversaries may look for details about the network configuration and settings, such as IP and/or MAC addresses, of systems they access or through information discovery of remote systems.

attack.mitre.org →

Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-46138Same product: Fit2Cloud Jumpserver

CVE-2026-31864Same product: Fit2Cloud Jumpserver

CVE-2025-27095Same product: Fit2Cloud Jumpserver

CVE-2023-42818Same product: Fit2Cloud Jumpserver

CVE-2023-46123Same product: Fit2Cloud Jumpserver

CVE-2023-43651Same product: Fit2Cloud Jumpserver

CVE-2024-29201Same product: Fit2Cloud Jumpserver

CVE-2024-29202Same product: Fit2Cloud Jumpserver

CVE-2024-40628Same product: Fit2Cloud Jumpserver

CVE-2024-40629Same product: Fit2Cloud Jumpserver

Affected Assets

fit2cloud

jumpserver

2.0.0 — 2.28.20 · 3.0.0 — 3.7.1

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

IA-5 Authenticator Management

addresses: CWE-640

Establishing procedures for lost or compromised authenticators addresses weak password recovery mechanisms.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-01 partial match

blocks

Credential lifecycle management directly includes password reset/recovery flows.

PR.AA-02 partial match

blocks

Identity proofing is the core control that prevents weak or bypassed recovery mechanisms.

PR.AA-03 partial match

blocks

Authentication policy covers strength/MFA but does not address recovery path weaknesses.

PR.PS-06 partial match

blocks

Secure SDLC reduces implementation flaws but is not specific to password-recovery design.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match

removes

A.5.15 Access control partial match

removes

A.5.16 Identity management partial match

removes

A.5.17 Authentication information partial match

degrades

Strong authentication-information lifecycle rules directly address weak password-recovery flows.

A.5.18 Access rights partial match

removes

A.8.10 Information deletion partial match