Legacy Node API Allows Impersonation in github.com/spiffe/spire/pkg/server/endpoints/node

published 2021-03-05 5 y ago modified 2026-07-08 4 mo ago also GHSA-h746-rm5q-8mgq , EUVD-2021-1097

cvss: 8.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 links 1

go github.com/spiffe/spire 0.8.5, 0.9.4, 0.10.2, 0.11.3, 0.12.1
cncf spire 0.9.4, 0.10.2, 0.11.3, 0.12.1

github.com/spiffe/spire@3c5115b commit

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD	2.0	5.5	AV:N/AC:L/Au:S/C:P/I:P/A:N
GitHub	3.1	8.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/spiffe/spire	>=0.8.1, <0.8.5 >=0.9.0, <0.9.4 >=0.10.0, <0.10.2 >=0.11.0, <0.11.3 >=0.12.0, <0.12.1	0.8.5 0.9.4 0.10.2 0.11.3 0.12.1

Classification

Weakness

CWE-295 Improper Certificate Validation
CWE-284 Improper Access Control

References

github.com /spiffe/spire/commit/3c5115b57afc20a0a2c2b1b9dd60dd1fd9082e13
web
github.com /spiffe/spire/security/advisories/GHSA-h746-rm5q-8mgq
web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-27098
advisory
cve.mitre.org /cgi-bin/cvename.cgi?name=CVE-2021-27098
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary