Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ios Xr | >= 5.1.1, < 6.5.2 |
| 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 | - |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/108026Third Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
- http://www.securityfocus.com/bid/108026Third Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
FAQ
What is CVE-2019-1686?
CVE-2019-1686 is a vulnerability with a CVSS score of 8.6 (HIGH). 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 prot...
How severe is CVE-2019-1686?
CVE-2019-1686 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-1686?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios Xr, Cisco Asr 9000V, Cisco Asr 9001, Cisco Asr 9006, Cisco Asr 9010.