Is CVE-2021-27098 actively exploited?

No active exploitation of CVE-2021-27098 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27098 be exploited remotely?

Yes. CVE-2021-27098 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27098?

CVE-2021-27098 has a CVSS score of 8.1 (HIGH).

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HIGH

CVE-2021-27098

CWE-295Published: March 5, 2021· Updated: Jun 17, 2026

8.1

CVSS v3.1

Official Description

In SPIRE 0.8.1 through 0.8.4 and before versions 0.9.4, 0.10.2, 0.11.3 and 0.12.1, specially crafted requests to the FetchX509SVID RPC of SPIRE Server’s Legacy Node API can result in the possible issuance of an X.509 certificate with a URI SAN for a SPIFFE ID that the agent is not authorized to distribute. Proper controls are in place to require that the caller presents a valid agent certificate that is already authorized to issue at least one SPIFFE ID, and the requested SPIFFE ID belongs to the same trust domain, prior to being able to trigger this vulnerability. This issue has been fixed in SPIRE versions 0.8.5, 0.9.4, 0.10.2, 0.11.3 and 0.12.1.

NVD Source

Technical Analysis

CVE-2021-27098 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 8.1.