Observable timing discrepancy in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via l
Observable timing discrepancy in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access.
- BDU:2021-03383
- DLA-2718-1
- DSA-4934-1
- openSUSE-SU-2021:0876-1
- openSUSE-SU-2021:1933-1
- openSUSE-SU-2024:11478-1
- RHSA-2021:2299
- RHSA-2021:2300
- RHSA-2021:2301
- RHSA-2021:2302
- RHSA-2021:2303
- RHSA-2021:2304
- RHSA-2021:2305
- RHSA-2021:2306
- RHSA-2021:2307
- RHSA-2021:2308
- RHSA-2021:3027
- RHSA-2021:3028
- RHSA-2021:3029
- RHSA-2021:3176
- Published
- Jun 9, 2021
- Updated
- Jun 16, 2026
- EPSS
- 0.4% · 30th percentile
- CWE
- CWE-203
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Report tools
Action score
13
Monitor
Low priority for now.
- CVSS
- 13 / 40 · 3.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| intel | microcode | cpe:2.3:o:intel:microcode |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| netapp | fas\/aff bios | cpe:2.3:o:netapp:fas\/aff_bios |
| netapp | hci compute node bios | cpe:2.3:o:netapp:hci_compute_node_bios |
| netapp | solidfire bios | cpe:2.3:o:netapp:solidfire_bios |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux10.0
- intel microcodebefore 20210608
- netapp fas/aff biosall versions
- netapp hci compute node biosall versions
- netapp solidfire biosall versions
Versions reported by the vendor
Affected version ranges reported by the assigning authority (intel). Independent of NVD's CPE analysis and usually ahead of it.
n/a Intel(R) Processors
- See referencesaffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:10 | intel-microcode | before 3.20210608.2~deb10u1 | 3.20210608.2~deb10u1 |
| Debian:12 | intel-microcode | before 3.20210608.1 | 3.20210608.1 |
| Debian:9 | intel-microcode | before 3.20210608.2~deb9u2 | 3.20210608.2~deb9u2 |
| openSUSE:Leap 15.2 | ucode-intel | before 20210525-lp152.2.17.1 | 20210525-lp152.2.17.1 |
| openSUSE:Leap 15.3 | ucode-intel | before 20210525-7.1 | 20210525-7.1 |
| openSUSE:Tumbleweed | ucode-intel | before 20210608-1.2 | 20210608-1.2 |
| Red Hat:enterprise_linux:7::client | microcode_ctl | before 2:2.1-73.9.el7_9 | 2:2.1-73.9.el7_9 |
| Red Hat:enterprise_linux:7::client | microcode_ctl | before 2:2.1-73.11.el7_9 | 2:2.1-73.11.el7_9 |
| Red Hat:enterprise_linux:7::client | microcode_ctl-debuginfo | before 2:2.1-73.9.el7_9 | 2:2.1-73.9.el7_9 |
| Red Hat:enterprise_linux:7::client | microcode_ctl-debuginfo | before 2:2.1-73.11.el7_9 | 2:2.1-73.11.el7_9 |
| Red Hat:enterprise_linux:8::baseos | microcode_ctl | before 4:20210216-1.20210608.1.el8_4 | 4:20210216-1.20210608.1.el8_4 |
| Red Hat:enterprise_linux:8::baseos | microcode_ctl | before 4:20210216-1.20210525.1.el8_4 | 4:20210216-1.20210525.1.el8_4 |
| Red Hat:rhel_aus:7.2::server | microcode_ctl | before 2:2.1-12.37.el7_2 | 2:2.1-12.37.el7_2 |
| Red Hat:rhel_aus:7.2::server | microcode_ctl | before 2:2.1-12.39.el7_2 | 2:2.1-12.39.el7_2 |
| Red Hat:rhel_aus:7.2::server | microcode_ctl-debuginfo | before 2:2.1-12.37.el7_2 | 2:2.1-12.37.el7_2 |
| Red Hat:rhel_aus:7.2::server | microcode_ctl-debuginfo | before 2:2.1-12.39.el7_2 | 2:2.1-12.39.el7_2 |
| Red Hat:rhel_aus:7.3::server | microcode_ctl | before 2:2.1-16.42.el7_3 | 2:2.1-16.42.el7_3 |
| Red Hat:rhel_aus:7.3::server | microcode_ctl | before 2:2.1-16.40.el7_3 | 2:2.1-16.40.el7_3 |
| Red Hat:rhel_aus:7.3::server | microcode_ctl-debuginfo | before 2:2.1-16.40.el7_3 | 2:2.1-16.40.el7_3 |
| Red Hat:rhel_aus:7.3::server | microcode_ctl-debuginfo | before 2:2.1-16.42.el7_3 | 2:2.1-16.42.el7_3 |
| Red Hat:rhel_aus:7.4::server | microcode_ctl | before 2:2.1-22.39.el7_4 | 2:2.1-22.39.el7_4 |
| Red Hat:rhel_aus:7.4::server | microcode_ctl | before 2:2.1-22.41.el7_4 | 2:2.1-22.41.el7_4 |
| Red Hat:rhel_aus:7.4::server | microcode_ctl-debuginfo | before 2:2.1-22.41.el7_4 | 2:2.1-22.41.el7_4 |
| Red Hat:rhel_aus:7.4::server | microcode_ctl-debuginfo | before 2:2.1-22.39.el7_4 | 2:2.1-22.39.el7_4 |
+22
Same product
intel: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-40982Information exposure through microarchitectural state after transient execution in certain vector execution units for some Intel(R) Processo27Monitor
- CVE-2020-24511Improper isolation of shared resources in some Intel(R) Processors may allow an authenticated user to potentially enable information disclos26Monitor
- CVE-2020-8698Improper isolation of shared resources in some Intel(R) Processors may allow an authenticated user to potentially enable information disclos22Monitor
- CVE-2020-8696Improper removal of sensitive information before storage or transfer in some Intel(R) Processors may allow an authenticated user to potentia22Monitor
- CVE-2023-23908Improper access control in some 3rd Generation Intel(R) Xeon(R) Scalable processors may allow a privileged user to potentially enable inform17Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:intel-microcode | 3.20210608.1 · Debian:12 | Package registry (OSV) |
| opensuse:ucode-intel | 20210525-lp152.2.17.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| red hat:microcode_ctl | 2:1.17-33.33.el6_10 · Red Hat:rhel_els:6 | Package registry (OSV) |
| red hat:microcode_ctl-debuginfo | 2:1.17-33.33.el6_10 · Red Hat:rhel_els:6 | Package registry (OSV) |
| rocky linux:microcode_ctl | 4:20210216-1.20210525.1.el8_4 · Rocky Linux:8 | Package registry (OSV) |
| suse:microcode_ctl | 1.17-102.83.71.1 · SUSE:Linux Enterprise Point of Sale 11 SP3 | Package registry (OSV) |
| suse:ucode-intel | 20210525-3.35.1 · SUSE:Linux Enterprise Server 12 SP5 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-203 · Observable DiscrepancyCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- cert-portal.siemens.com/productcert/pdf/ssa-309571.pdf
- lists.debian.org/debian-lts-announce/2021/07/msg00022.html
- security.netapp.com/advisory/ntap-20210611-0005/
- www.debian.org/security/2021/dsa-4934
- www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00464.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.