Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
High
Attack Vector
Local
1

CVE-2021-1376

Disclosure Date: March 24, 2021 •
CVE-2021-1376 CVSS v3 Base Score: 6.7
Add MITRE ATT&CK tactics and techniques that apply to this CVE.
Initial Access
Techniques
Validation
Validated
Validated

Description

Multiple vulnerabilities in the fast reload feature of Cisco IOS XE Software running on Cisco Catalyst 3850, Cisco Catalyst 9300, and Cisco Catalyst 9300L Series Switches could allow an authenticated, local attacker to either execute arbitrary code on the underlying operating system, install and boot a malicious software image, or execute unsigned binaries on an affected device. These vulnerabilities are due to improper checks performed by system boot routines. To exploit these vulnerabilities, the attacker would need privileged access to the CLI of the device. A successful exploit could allow the attacker to either execute arbitrary code on the underlying operating system or execute unsigned code and bypass the image verification check part of the secure boot process. For more information about these vulnerabilities, see the Details section of this advisory.

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CVSS V3 Severity and Metrics
Base Score:
6.7 Medium
Impact Score:
5.9
Exploitability Score:
0.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
High
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Cisco IOS XE Software n/a
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • cisco

Products

  • ios xe 16.10.1,
  • ios xe 16.10.1e,
  • ios xe 16.10.1s,
  • ios xe 16.11.1,
  • ios xe 16.11.1b,
  • ios xe 16.11.1c,
  • ios xe 16.11.1s,
  • ios xe 16.11.2,
  • ios xe 16.12.1,
  • ios xe 16.12.1c,
  • ios xe 16.12.1s,
  • ios xe 16.12.2,
  • ios xe 16.12.2s,
  • ios xe 16.12.2t,
  • ios xe 16.12.3,
  • ios xe 16.12.3a,
  • ios xe 16.12.3s,
  • ios xe 16.12.4,
  • ios xe 16.12.4a,
  • ios xe 16.5.1,
  • ios xe 16.5.1a,
  • ios xe 16.6.1,
  • ios xe 16.6.2,
  • ios xe 16.6.3,
  • ios xe 16.6.4,
  • ios xe 16.6.4a,
  • ios xe 16.6.4s,
  • ios xe 16.6.5,
  • ios xe 16.6.6,
  • ios xe 16.6.7,
  • ios xe 16.6.8,
  • ios xe 16.8.1,
  • ios xe 16.8.1a,
  • ios xe 16.8.1s,
  • ios xe 16.9.1,
  • ios xe 16.9.1s,
  • ios xe 16.9.2,
  • ios xe 16.9.2s,
  • ios xe 16.9.3,
  • ios xe 16.9.3a,
  • ios xe 16.9.3s,
  • ios xe 16.9.4,
  • ios xe 16.9.5,
  • ios xe 16.9.6,
  • ios xe 17.1.1,
  • ios xe 17.1.1s,
  • ios xe 17.1.1t,
  • ios xe 17.1.2,
  • ios xe 17.2.1,
  • ios xe 17.2.1a

Additional Info

Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Technical Analysis