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.
Published 2019-04-17 22:29:00
Updated 2020-10-16 13:01:59
View at NVD,   CVE.org
Vulnerability category: BypassGain privilege

Exploit prediction scoring system (EPSS) score for CVE-2019-1686

0.14%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 49 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-1686

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:N
10.0
2.9
NIST
5.8
MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
3.9
1.4
Cisco Systems, Inc.
8.6
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
3.9
4.0
NIST

CWE ids for CVE-2019-1686

  • The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
    Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2019-1686

Products affected by CVE-2019-1686

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