CVE-2024-21820: intel-microcode Incorrect Default Permissions
CVSS: 8.5v4.0HighDeferred
AliasesUBUNTU-CVE-2024-21820DEBIAN-CVE-2024-21820
Published 13-11-2024Last modified 03-11-2025
Vulnerability summary
CVE-2024-21820 is a high (CVSS 8.5) Incorrect Default Permissions vulnerability in intel-microcode. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.3% of scored vulnerabilities.
CVSS score
8.5/10
010
High · v4.0 (CVE.org)EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 9 · Related 7Timeline
- 13-11-2024PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
Description
Incorrect default permissions in some Intel(R) Xeon(R) processor memory controller configurations when using Intel(R) SGX may allow a privileged user to potentially enable escalation of privilege via local access.
CVSS metrics
6 scores · 4 sources · 2 versionsHigh 8.5Preferred score · CVE.org (CNA)
CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated8.5HighCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- OSV · DebianEcosystem advisory · calculated8.5HighCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVDNIST8.5HighCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
High 7.2Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:NSourcesAll 2 agree
- NVDNIST7.2HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
0.00 pp
From 0.22% on 20-09-2026
20-09-202620-10-2026
EPSS score0.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- intel-microcode< 3.20241112.1~deb12u1 | < 3.20241112.1
Ubuntu1 product
- intel-microcodeAll versions (No fix recorded) | < 3.20241112.0ubuntu0.16.04.1+esm1 | < 3.20241112.0ubuntu0.18.04.1+esm1 | < 3.20241112.0ubuntu0.20.04.1 | < 3.20241112.0ubuntu0.22.04.1 | < 3.20241112.0ubuntu0.24.04.1
2 vendors · 2 products
