CVE-2021-1440

Cisco IOS XR Software BGP Resource Public Key Infrastructure Denial of Service Vulnerability

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

A vulnerability in the implementation of the Resource Public Key Infrastructure (RPKI) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause the Border Gateway Protocol (BGP) process to crash, resulting in a denial of service (DoS) condition.
This vulnerability is due to the incorrect handling of a specific RPKI to Router (RTR) Protocol packet header. An attacker could exploit this vulnerability by compromising the RPKI validator server and sending a specifically crafted RTR packet to an affected device. Alternatively, the attacker could use man-in-the-middle techniques to impersonate the RPKI validator server and send a specifically crafted RTR response packet over the established RTR TCP connection to the affected device. A successful exploit could allow the attacker to cause a DoS condition because the BGP process could constantly restart and BGP routing could become unstable.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2021 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .

Una vulnerabilidad en la implementación de la característica Resource Public Key Infrastructure (RPKI) del software Cisco IOS XR podría permitir que un atacante remoto no autenticado provoque el bloqueo del proceso del protocolo de puerta de enlace fronteriza (BGP), lo que daría lugar a una condición de denegación de servicio (DoS). Esta vulnerabilidad se debe al manejo incorrecto de un encabezado de paquete específico del protocolo RPKI a enrutador (RTR). Un atacante podría aprovechar esta vulnerabilidad comprometiendo el servidor validador de RPKI y enviando un paquete RTR específicamente manipulado a un dispositivo afectado. Como alternativa, el atacante podría utilizar técnicas de intermediario para hacerse pasar por el servidor validador de RPKI y enviar un paquete de respuesta RTR específicamente manipulado a través de la conexión TCP RTR establecida al dispositivo afectado. Una explotación exitosa podría permitir al atacante provocar una condición de DoS porque el proceso BGP podría reiniciarse constantemente y el enrutamiento BGP podría volverse inestable. Cisco ha publicado actualizaciones de software que solucionan esta vulnerabilidad. No existen workarounds que aborden esta vulnerabilidad. Este aviso es parte de la publicación de septiembre de 2021 del paquete de avisos de seguridad del software Cisco IOS XR. Para obtener una lista completa de los avisos y los enlaces a ellos, consulte .

*Credits: N/A

CVSS Scores

Ciscov3.1 6.8

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2020-11-13 CVE Reserved
2024-11-18 CVE Published
2024-11-18 CVE Updated
2024-11-19 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-617: Reachable Assertion

CAPEC

References (4)

URL	Tag	Source
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrbgp-rpki-dos-gvmjqxbk
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-sigverbypass-gPYXd6Mk
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-sma-info-disclo-VOu2GHbZ

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.6.1 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.6.1"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.5.3 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.5.3"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.0.1 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.0.1"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.6.11 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.6.11"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.5.1 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.5.1"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.5.2 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.5.2"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.6.2 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.6.2"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.6.12 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.6.12"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.6.25 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.6.25"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.1.1 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.1.1"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.0.90 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.0.90"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.6.3 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.6.3"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.0.2 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.0.2"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.1.2 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.1.2"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.2.1 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.2.1"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.0.11 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.0.11"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.0.12 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.0.12"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.0.14 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.0.14"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				6.6.4 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "6.6.4"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.2.12 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.2.12"		en		Affected
Cisco Search vendor "Cisco"		Cisco IOS XR Software Search vendor "Cisco" for product "Cisco IOS XR Software"				7.2.2 Search vendor "Cisco" for product "Cisco IOS XR Software" and version "7.2.2"		en		Affected