CVE-2019-1686: Cisco ASR 9000 Series Aggregation Services Routers ACL Bypass Vulnerability
First published: Wed Apr 17 2019(Updated: )
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.
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | >=5.1.1<6.5.2 | |
| Cisco IOS XR | >=6.5.3<6.6.1 | |
| Cisco Asr 9000v | ||
| Cisco Asr 9001 | ||
| Cisco Asr 9006 | ||
| Cisco Asr 9010 | ||
| Cisco Asr 9901 | ||
| Cisco Asr 9904 | ||
| Cisco Asr 9906 | ||
| Cisco Asr 9910 | ||
| Cisco Asr 9912 | ||
| Cisco Asr 9922 | ||
| All of | ||
| Any of | ||
| Cisco IOS XR | >=5.1.1<6.5.2 | |
| Cisco IOS XR | >=6.5.3<6.6.1 | |
| Any of | ||
| Cisco Asr 9000v | ||
| Cisco Asr 9001 | ||
| Cisco Asr 9006 | ||
| Cisco Asr 9010 | ||
| Cisco Asr 9901 | ||
| Cisco Asr 9904 | ||
| Cisco Asr 9906 | ||
| Cisco Asr 9910 | ||
| Cisco Asr 9912 | ||
| Cisco Asr 9922 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1686?
CVE-2019-1686 is a vulnerability in the TCP flags inspection feature for access control lists (ACLs) on Cisco ASR 9000 Series Aggregation Services Routers.
How does CVE-2019-1686 affect Cisco ASR 9000 routers?
CVE-2019-1686 allows an unauthenticated, remote attacker to bypass protection offered by a configured ACL on an affected device.
What is the severity of CVE-2019-1686?
CVE-2019-1686 has a severity rating of 8.6, which is considered high.
How can I check if my Cisco ASR 9000 router is affected by CVE-2019-1686?
Check the affected software section in the vulnerability report and compare it with the software version running on your router.
How do I mitigate the CVE-2019-1686 vulnerability?
Apply the necessary updates provided by Cisco to fix the vulnerability on your Cisco ASR 9000 router.
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- vendor/cisco
- canonical/cisco ios xr
- version/cisco ios xr/5.1.1
- version/cisco ios xr/6.5.3
- canonical/cisco asr 9000v
- canonical/cisco asr 9001
- canonical/cisco asr 9006
- canonical/cisco asr 9010
- canonical/cisco asr 9901
- canonical/cisco asr 9904
- canonical/cisco asr 9906
- canonical/cisco asr 9910
- canonical/cisco asr 9912
- canonical/cisco asr 9922