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NVD / CVE Program· CNA intel

CVE-2023-22655: Protection mechanism failure in some 3rd and 4th Generation Intel(R) Xeon(R) Processors when using Intel(R) SGX or Intel(R) TDX may allow a

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: microcode_ctl (AlmaLinux:9) 4:20240910-1.el9_5; intel-ucode (Alpine:v3.17) 20240813-r0; intel-ucode (Alpine:v3.19) 20240312-r0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to microcode_ctl (AlmaLinux:9) 4:20240910-1.el9_5; intel-ucode (Alpine:v3.17) 20240813-r0; intel-ucode (Alpine:v3.19) 20240312-r0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Protection mechanism failure in some 3rd and 4th Generation Intel(R) Xeon(R) Processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access.

MediumCVSS 6.1 · v3.1—No exploit Fix available
Published
Mar 14, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 16th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · intel
6.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-22655

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
intel3rd gen intel xeon scalable processor family
intelxeon d processor
intel4th generation intel xeon platinum processors
intel4th generation intel xeon gold processors
intel4th gen intel xeon scalable processors
intel4th gen intel xeon platinum processors
intel4th gen intel xeon gold processors
intel4th gen intel xeon silver processors
intel4th gen intel xeon bronze processors
intelxeon cpu max series processors
intel4th gen intel xeon scalable processors with intel vran

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 3rd and 4th Generation Intel(R) Xeon(R) Processors when using Intel(R) SGX or Intel(R) TDX

    • See referencesaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9microcode_ctlbefore 4:20240910-1.el9_54:20240910-1.el9_5
Alpine:v3.17intel-ucodebefore 20240813-r020240813-r0
Alpine:v3.19intel-ucodebefore 20240312-r020240312-r0
Debian:10intel-microcodebefore 3.20240312.1~deb10u13.20240312.1~deb10u1
Debian:12intel-microcodebefore 3.20240312.1~deb12u13.20240312.1~deb12u1
Debian:13intel-microcodebefore 3.20240312.13.20240312.1
openSUSE:Leap Micro 5.3ucode-intelbefore 20240312-150200.38.120240312-150200.38.1
openSUSE:Tumbleweeducode-intelbefore 20240312-1.120240312-1.1
Red Hat:enterprise_linux:9::baseosmicrocode_ctlbefore 4:20230808-2.20240531.1.el9_44:20230808-2.20240531.1.el9_4
Red Hat:enterprise_linux:9::baseosmicrocode_ctlbefore 4:20240910-1.el9_54:20240910-1.el9_5
Rocky Linux:9microcode_ctlbefore 4:20240910-1.el9_54:20240910-1.el9_5
SUSE:Linux Enterprise Micro 5.3ucode-intelbefore 20240312-150200.38.120240312-150200.38.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREmicrocode_ctlbefore 1.17-102.83.81.11.17-102.83.81.1
SUSE:Linux Enterprise Server 12 SP5ucode-intelbefore 20240312-134.120240312-134.1
SUSE:Linux Micro 6.0ucode-intelbefore 20240813-1.120240813-1.1

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:microcode_ctl4:20240910-1.el9_5 · AlmaLinux:9Package registry (OSV)
alpine:intel-ucode20240813-r0 · Alpine:v3.17Package registry (OSV)
debian:intel-microcode3.20240312.1~deb12u1 · Debian:12Package registry (OSV)
opensuse:ucode-intel20240312-150200.38.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
red hat:microcode_ctl4:20230808-2.20240531.1.el9_4 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
rocky linux:microcode_ctl4:20240910-1.el9_5 · Rocky Linux:9Package registry (OSV)
suse:microcode_ctl1.17-102.83.81.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:ucode-intel20240312-134.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:ucode-intel20240312-150200.38.1 · SUSE:Linux Enterprise Micro 5.3Package 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.

No history yet (it accumulates with the daily EPSS job).

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 researchers

Finders, 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.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
high · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality impact
Low
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-693 · Protection Mechanism Failure

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:H/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records