Improper signature verification in keylime
Priority MEDIUM 43CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass, Spoofing
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347 and CWE-295.
Summary
A flaw was found in keylime 5.8.1 and older. The issue in the Keylime agent and registrar code invalidates the cryptographic chain of trust from the Endorsement Key certificate to agent attestations.
Why it matters now
EPSS 0.00658 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | keylime | 5.8.1 and older | — | No fix listed | CNA |
- keylime Vendor— Affected 5.8.1 and older Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:keylime:keylime:*:*:*:*:*:*:*:* | up to 5.8.1 | Vulnerable | Keylime |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
- cpe:2.3:a:keylime:keylime:*:*:*:*:*:*:*:* Versions up to 5.8.1 Vulnerable ·Keylime
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3406
- 2026-10-09 EPSS moved to the 50th–90th percentile
References
Sources
- CVE-2021-3406 · CVE Program
- CVE-2021-3406 · NVD
- FIRST EPSS
- CVE-2021-3406 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences