CVE-2020-5955
No exploitation reported by the sources we read.
- Published2021-11-03
- Fixed in05.42.11.0026 · 05.42.09.0003 · 05.41.35.0001 · 05.34.09.0030 · 05.32.47.0001 · 05.32.30.0001
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
An issue was discovered in Int15MicrocodeSmm in Insyde InsydeH2O before 2021-10-14 on Intel client chipsets. A caller may be able to escalate privileges.
Timeline
dates in UTC- 2021-11-0301:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-5955?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-5955?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.42 | < 05.42.11.0026 | 05.42.11.0026 | NVD |
| 5.42 | < 05.42.09.0003 | 05.42.09.0003 | NVD |
| 5.41 | < 05.41.35.0001 | 05.41.35.0001 | NVD |
| 5.34 | < 05.34.09.0030 | 05.34.09.0030 | NVD |
| 5.32 | < 05.32.47.0001 | 05.32.47.0001 | NVD |
| 5.32 | < 05.32.30.0001 | 05.32.30.0001 | NVD |
| 5.23 | < 05.23.45.0023 | 05.23.45.0023 | NVD |
| 5.23 | < 05.23.27.0001 | 05.23.27.0001 | NVD |
| 5.23 | < 05.23.04.0045 | 05.23.04.0045 | NVD |
| 5.21 | < 05.21.51.0040 | 05.21.51.0040 | NVD |
| 5.21 | < 05.21.43.0001 | 05.21.43.0001 | NVD |
| 5.12 | < 05.12.09.0075 | 05.12.09.0075 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Insyde insydeh2o uefi bios to 05.42.11.0026 · 05.42.09.0003 · 05.41.35.0001 · 05.34.09.0030 · 05.32.47.0001 · 05.32.30.0001 · 05.23.45.0023 · 05.23.27.0001
Advisories and patches
- www.insyde.comVendor Advisory
- www.insyde.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.19.8read 2026-10-23
- NVDCVSS 2.07.5read 2026-10-23
- FIRST EPSSEPSS score1.4 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2021-11-03
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-5955?
Is CVE-2020-5955 actively exploited?
What is the CVSS score for CVE-2020-5955?
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