8.1

CVE-2021-27098: cncf spire Improper Certificate Validation

CVSS: 8.1v3.1HighModified
AliasesGHSA-h746-rm5q-8mgq
Published 05-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-27098 is a high (CVSS 8.1) Improper Certificate Validation vulnerability in cncf spire. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.6% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
0.56%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 05-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.56%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

0.00 pp

From 0.56% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.56%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cncf1 product
  • spire≥ 0.8.1, ≤ 0.8.4 | ≥ 0.9.0, < 0.9.4 | ≥ 0.10.0, < 0.10.2 | ≥ 0.11.0, < 0.11.3 | ≥ 0.12.0, < 0.12.1
Github.com/spiffe1 product
  • 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

2 vendors · 2 products

References

4 links