Is CVE-2021-43834 actively exploited?

No active exploitation of CVE-2021-43834 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-43834 be exploited remotely?

Yes. CVE-2021-43834 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-43834?

CVE-2021-43834 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-43834

CWE-287Published: December 16, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

eLabFTW is an electronic lab notebook manager for research teams. In versions prior to 4.2.0 there is a vulnerability which allows an attacker to authenticate as an existing user, if that user was created using a single sign-on authentication option such as LDAP or SAML. It impacts instances where LDAP or SAML is used for authentication instead of the (default) local password mechanism. Users should upgrade to at least version 4.2.0.

NVD Source

Technical Analysis

CVE-2021-43834 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.