CVE-2021-27099

MEDIUM

6.8

CVSS Score

Published: March 5, 2021 at 05:04 PM UTC

Updated: June 17, 2026 at 03:44 AM UTC

1 product affected across 1 vendorSpire

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Severity

MEDIUM6.8

Exploit prediction

EPSS 0.7%

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spire · Cncf

95%

v < 0.8.50.10.0 ≤ v < 0.10.20.11.0 ≤ v < 0.11.30.12.0 ≤ v < 0.12.10.9.0 ≤ v < 0.9.4

Affected range stops below 0.10.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 0.11.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 0.12.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 0.8.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 0.9.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/spiffe/spire/security/advisories/GHSA-q7gm-mjrg-44h9

References (1)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/spiffe/spire/security/advisories/GHSA-q7gm-mjrg-44h9

CVSS

6.8MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: HIGH
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-863

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