CVE-2019-1909: Cisco IOS XR Software Border Gateway Protocol Denial of Service Vulnerability
First published: Sat Jul 06 2019(Updated: )
A vulnerability in the implementation of Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected system. The vulnerability is due to incorrect processing of certain BGP update messages. An attacker could exploit this vulnerability by sending BGP update messages that include a specific set of attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic from explicitly defined peers only. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | >=4.3.1<6.6.2 | |
| 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 9920 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1909?
CVE-2019-1909 is a vulnerability in the implementation of Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected system.
How does CVE-2019-1909 affect Cisco IOS XR Software?
CVE-2019-1909 affects Cisco IOS XR Software versions 4.3.1 to 6.6.2.
What is the severity of CVE-2019-1909?
CVE-2019-1909 has a severity rating of 5.9 (medium).
How can I fix CVE-2019-1909?
To fix CVE-2019-1909, Cisco has released a software update. Refer to the Cisco Security Advisory for more information.
Where can I find more information about CVE-2019-1909?
You can find more information about CVE-2019-1909 in the Cisco Security Advisory.
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- collector/mitre-cve
- source/MITRE
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- agent/weakness
- agent/title
- agent/references
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- agent/last-modified-date
- agent/softwarecombine
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- vendor/cisco
- canonical/cisco ios xr
- version/cisco ios xr/4.3.1
- 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 9920