CVE-2019-5892

bgpd in FRRouting FRR (aka Free Range Routing) 2.x and 3.x before 3.0.4, 4.x before 4.0.1, 5.x before 5.0.2, and 6.x before 6.0.2 (not affecting Cumulus Linux or VyOS), when ENABLE_BGP_VNC is used for Virtual Network Control, allows remote attackers to cause a denial of service (peering session flap) via attribute 255 in a BGP UPDATE packet. This occurred during Disco in January 2019 because FRR does not implement RFC 7606, and therefore the packets with 255 were considered invalid VNC data and the BGP session was closed.

• CWE-436

• https://frrouting.org/community/security/cve-2019-5892.htmlVendor Advisory
• https://github.com/FRRouting/frr/commit/943d595a018e69b550db08cccba1d0778a86705aPatch, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-3.0.4Release Notes, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-4.0.1Release Notes, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-5.0.2Release Notes, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-6.0.2Release Notes, Third Party Advisory
• https://lists.frrouting.org/pipermail/frog/2019-January/000404.htmlPatch, Vendor Advisory
• https://frrouting.org/community/security/cve-2019-5892.htmlVendor Advisory
• https://github.com/FRRouting/frr/commit/943d595a018e69b550db08cccba1d0778a86705aPatch, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-3.0.4Release Notes, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-4.0.1Release Notes, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-5.0.2Release Notes, Third Party Advisory
• https://github.com/FRRouting/frr/releases/tag/frr-6.0.2Release Notes, Third Party Advisory
• https://lists.frrouting.org/pipermail/frog/2019-January/000404.htmlPatch, Vendor Advisory

Published

Jan 10, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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