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Vulnerability Details : CVE-2019-1686

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.
Publish Date : 2019-04-17 Last Update Date : 2019-10-09
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID 284

- Products Affected By CVE-2019-1686

# Product Type Vendor Product Version Update Edition Language
1 OS Cisco Ios Xr 5.1.1 Version Details Vulnerabilities
2 OS Cisco Ios Xr 5.1.1.k9sec Version Details Vulnerabilities
3 OS Cisco Ios Xr 5.1.2 Version Details Vulnerabilities
4 OS Cisco Ios Xr 5.1.3 Version Details Vulnerabilities
5 OS Cisco Ios Xr 5.2.0 Version Details Vulnerabilities
6 OS Cisco Ios Xr 5.2.1 Version Details Vulnerabilities
7 OS Cisco Ios Xr 5.2.2 Version Details Vulnerabilities
8 OS Cisco Ios Xr 5.2.4 Version Details Vulnerabilities
9 OS Cisco Ios Xr 5.3.0 Base Version Details Vulnerabilities
10 OS Cisco Ios Xr 5.3.0 Version Details Vulnerabilities
11 OS Cisco Ios Xr 5.3.2 Version Details Vulnerabilities
12 OS Cisco Ios Xr 6.0 Base Version Details Vulnerabilities
13 OS Cisco Ios Xr 6.0.0 Version Details Vulnerabilities
14 OS Cisco Ios Xr 6.0.1 Version Details Vulnerabilities
15 OS Cisco Ios Xr 6.0.2 Version Details Vulnerabilities
16 OS Cisco Ios Xr Version Details Vulnerabilities
17 OS Cisco Ios Xr 6.1.0 Version Details Vulnerabilities
18 OS Cisco Ios Xr 6.1.1 Version Details Vulnerabilities
19 OS Cisco Ios Xr 6.2.1 Version Details Vulnerabilities
20 OS Cisco Ios Xr 6.4.1 Base Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Cisco Ios Xr 20

- References For CVE-2019-1686
BID 108026 Cisco ASR 9000 Series Aggregation Services Routers Remote Security Bypass Vulnerability Release Date:2019-04-17
CISCO 20190417 Cisco ASR 9000 Series Aggregation Services Routers ACL Bypass Vulnerability

- Vulnerability Conditions

Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)

- Metasploit Modules Related To CVE-2019-1686

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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