Is CVE-2021-21693 actively exploited?

No active exploitation of CVE-2021-21693 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21693 be exploited remotely?

Yes. CVE-2021-21693 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21693?

CVE-2021-21693 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-21693

CWE-863Published: November 4, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

When creating temporary files, agent-to-controller access to create those files is only checked after they've been created in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.

NVD Source

Technical Analysis

CVE-2021-21693 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.