CVE-2021-1136

Cisco IOS XR Software for Cisco 8000 Series Routers and Network Convergence System 540 Series Routers Image Verification Vulnerabilities

Severity Score

6.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers could allow an authenticated, local attacker to execute unsigned code during the boot process on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Múltiples vulnerabilidades en los Enrutadores Cisco Network Convergence System (NCS) 540 Series, solo cuando ejecutan imágenes de software de NCS540L de Cisco IOS XR y el Software Cisco IOS XR para los Enrutadores Cisco 8000 Series podrían permitir a un atacante autenticado local ejecutar código sin firmar durante el proceso de arranque en un dispositivo afectado. Para mayor información sobre estas vulnerabilidades, consulte la sección Detalles de este aviso

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2020-11-13 CVE Reserved
2021-02-04 CVE Published
2023-03-08 EPSS Updated
2024-11-08 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-347: Improper Verification of Cryptographic Signature

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ioxr-l-zNhcGCBt	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8201 Search vendor "Cisco" for product "8201"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8202 Search vendor "Cisco" for product "8202"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8808 Search vendor "Cisco" for product "8808"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8812 Search vendor "Cisco" for product "8812"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8818 Search vendor "Cisco" for product "8818"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8201 Search vendor "Cisco" for product "8201"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8202 Search vendor "Cisco" for product "8202"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8808 Search vendor "Cisco" for product "8808"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8812 Search vendor "Cisco" for product "8812"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8818 Search vendor "Cisco" for product "8818"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	Ncs 540 Search vendor "Cisco" for product "Ncs 540"	-	-	Safe