Is CVE-2021-27099 actively exploited?

No active exploitation of CVE-2021-27099 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27099 be exploited remotely?

Yes. CVE-2021-27099 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27099?

CVE-2021-27099 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2021-27099

CWE-863Published: March 5, 2021· Updated: Jun 17, 2026

6.8

CVSS v3.1

Official Description

In SPIRE before versions 0.8.5, 0.9.4, 0.10.2, 0.11.3 and 0.12.1, the "aws_iid" Node Attestor improperly normalizes the path provided through the agent ID templating feature, which may allow the issuance of an arbitrary SPIFFE ID within the same trust domain, if the attacker controls the value of an EC2 tag prior to attestation, and the attestor is configured for agent ID templating where the tag value is the last element in the path. This issue has been fixed in SPIRE versions 0.11.3 and 0.12.1

NVD Source

Technical Analysis

CVE-2021-27099 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low 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 6.8.