Insufficient control flow Intel CPU

Advisory ID CVE Number Date discovered Severity Advisory revision
STORM-2021-067 CVE-2021-0127 12/06/2021 medium v1

Vulnerability details

A vulnerability in some Intel processor may allow a denial of service

Impacted products

Stormshield Network Security medium SNS is impacted


Version Date Description
v1  02/09/2022 Reserved publication
v2 24/03/2023 Public publication


Stormshield Network Security

CVSS v3.1 Overall Score: 5.2      


Impacted version

This vulnerability could allow an attacker with a local access (ability to run on SNS his own code or script) to the appliance to potentially enable denial of service. This vulnerability is useless for an attacker who already have administrator access because an administrator is the highest privileges on the appliance. As this vulnerability can only be exploited locally, it can not provide an external attacker access to an SNS appliance.

SN1100, SN2100, SN3100, SN6100 are impacted

  • SNS 4.0.0 to 4.2.9
  • SNS 4.3.0 to 4.3.4

Workaround solution


There is no workaround solution.

As stated in the analysis, this vulnerability can only be exploited locally. On SNS, local access are only granted to user with the highest privileges. Therefore an exploitation of this vulnerability is useless to a SNS local user.

Nevertheless, a fix for this vulnerability has been delivered in the following versions :

  • SNS 4.2.9
  • SNS 4.3.4
  • SNS 4.4.0

Attack Vector Attack Complexity Privileges Required User Interaction Scope Confidentiality Impact Integrity Impact Availability impact
Local High High None Unchanged None None High
CVSS Base score: 4.1 CVSS Vector: (AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H)
Exploit Code Maturity Remediation Level Report Confidence
Unproven that exploit exists Official fix Confirmed
CVSS Temporal score: 3.6 CVSS Vector: (AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Confidentiality Requirement Integrity Requirement Availability Requirement
High High High
CVSS Environmental score: 5.2 CVSS Vector: (AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C/CR:H/IR:H/AR:H/MAV:X/MAC:X/MPR:X/MUI:X/MS:X/MC:X/MI:X/MA:X)