// For flags

CVE-2019-1686

Cisco ASR 9000 Series Aggregation Services Routers ACL Bypass Vulnerability

Severity Score

8.6
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A vulnerability in the TCP flags inspection feature for access control lists (ACLs) on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass protection offered by a configured ACL on an affected device. The vulnerability is due to incorrect processing of the ACL applied to an interface of an affected device when Cisco Express Forwarding load balancing using the 3-tuple hash algorithm is enabled. An attacker could exploit this vulnerability by sending traffic through an affected device that should otherwise be denied by the configured ACL. An exploit could allow the attacker to bypass protection offered by a configured ACL on the affected device. There are workarounds that address this vulnerability. Affected Cisco IOS XR versions are: Cisco IOS XR Software Release 5.1.1 and later till first fixed. First Fixed Releases: 6.5.2 and later, 6.6.1 and later.

Una vulnerabilidad en el indicador función de inspección de marcas TCP para listas de control de acceso (ACL) en ASR 9000 Series Aggregation Services de Cisco versión ASR 9000 Series podría permitir que un atacante remoto no identificado omita la protección ofrecida por una ACL configurada en un dispositivo afectado. La vulnerabilidad se debe a un procesamiento incorrecto de la ACL aplicada a una interfaz de un dispositivo afectado cuando se habilita el equilibrio de carga de Cisco Express Forwarding utilizando el algoritmo de hash de 3 tuplas. Un atacante podría aprovechar esta vulnerabilidad enviando tráfico por medio de un dispositivo afectado que, de lo contrario, debería ser rechazado por la ACL configurada. Una operación podría permitir al atacante omitir la protección ofrecida por una ACL configurada en el dispositivo afectado. Hay soluciones que abordan esta vulnerabilidad. Las versiones afectadas de Cisco IOS XR son: Cisco IOS XR Software Release versión 5.1.1 y posteriores hasta su primera reparación. Primeros lanzamientos fijos: versión 6.5.2 y posteriores, versión 6.6.1 y posteriores.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2018-12-06 CVE Reserved
  • 2019-04-17 CVE Published
  • 2024-09-07 EPSS Updated
  • 2024-09-16 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-284: Improper Access Control
CAPEC
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"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9000v
Search vendor "Cisco" for product "Asr 9000v"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9001
Search vendor "Cisco" for product "Asr 9001"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9006
Search vendor "Cisco" for product "Asr 9006"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9010
Search vendor "Cisco" for product "Asr 9010"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9901
Search vendor "Cisco" for product "Asr 9901"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9904
Search vendor "Cisco" for product "Asr 9904"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9906
Search vendor "Cisco" for product "Asr 9906"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9910
Search vendor "Cisco" for product "Asr 9910"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9912
Search vendor "Cisco" for product "Asr 9912"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 5.1.1 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 5.1.1 < 6.5.2"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9922
Search vendor "Cisco" for product "Asr 9922"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9000v
Search vendor "Cisco" for product "Asr 9000v"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9001
Search vendor "Cisco" for product "Asr 9001"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9006
Search vendor "Cisco" for product "Asr 9006"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9010
Search vendor "Cisco" for product "Asr 9010"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9901
Search vendor "Cisco" for product "Asr 9901"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9904
Search vendor "Cisco" for product "Asr 9904"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9906
Search vendor "Cisco" for product "Asr 9906"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9910
Search vendor "Cisco" for product "Asr 9910"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9912
Search vendor "Cisco" for product "Asr 9912"
--
Safe
Cisco
Search vendor "Cisco"
Ios Xr
Search vendor "Cisco" for product "Ios Xr"
>= 6.5.3 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.3 < 6.6.1"
-
Affected
in Cisco
Search vendor "Cisco"
Asr 9922
Search vendor "Cisco" for product "Asr 9922"
--
Safe