A vulnerability in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of a BGP update message that contains crafted EVPN attributes. An attacker could indirectly exploit the vulnerability by sending BGP EVPN update messages with a specific, malformed attribute to an affected system and waiting for a user on the device to display the EVPN operational routes’ status. If successful, the attacker could cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. 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.
A vulnerability in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of a BGP update message that contains crafted EVPN attributes. An attacker could indirectly exploit the vulnerability by sending BGP EVPN update messages with a specific, malformed attribute to an affected system and waiting for a user on the device to display the EVPN operational routes’ status. If successful, the attacker could cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. 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.
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Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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AND
OR
*cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:*
OR
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:*
AND
OR
*cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:*
OR
cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:ncs_540l:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:*
cp
AND
OR
*cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:*
OR
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:*
AND
OR
*cpe:2.3:o:cisco:ios_xr:7.0.1:*:*:*:*:*:*:*
OR
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:x64:*
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:*
Added
CVSS V2
NIST (AV:N/AC:M/Au:N/C:N/I:N/A:P)
Added
CVSS V2 Metadata
Victim must voluntarily interact with attack mechanism
Added
CVSS V3.1
NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Added
CWE
NIST CWE-400
Changed
Reference Type
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-routes No Types Assigned
