Is CVE-2026-6420 actively exploited?

No active exploitation of CVE-2026-6420 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-6420 be exploited remotely?

No. CVE-2026-6420 requires local access to exploit.

What is the CVSS score of CVE-2026-6420?

CVE-2026-6420 has a CVSS score of 6.3 (MEDIUM).

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MEDIUM

CVE-2026-6420

CWE-1241Published: May 6, 2026· Updated: May 7, 2026

6.3

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.8th

Official Description

A flaw was found in Keylime. An attacker with root access on an enrolled monitored machine, where the Keylime agent runs, can exploit a vulnerability in the Keylime verifier. The verifier uses a hardcoded challenge nonce for Trusted Platform Module (TPM) quote attestation instead of a cryptographically random value. This allows the attacker to stockpile valid TPM quotes and replay them to evade detection after compromising the system. This issue affects only the push model deployment.

NVD Source

Technical Analysis

CVE-2026-6420 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 6.3.