CVE-2017-12319
Published: March 3, 2022
Official Description
A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability.
CISA KEV Advisory
Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability
A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability.
Apply updates per vendor instructions.
Risk Analysis
This high-severity vulnerability in Cisco IOS XE Software's BGP over EVPN could allow an unauthenticated, remote attacker to cause a device reload, leading to a denial of service, or potentially corrupt the BGP routing table, causing network instability. While a CVSS score is not available, its inclusion in CISA's KEV catalog and an EPSS score of 0.00937 indicate a confirmed and notable exploitation risk.
This vulnerability has been actively exploited in the wild, as confirmed by its presence in CISA's Known Exploited Vulnerabilities catalog. The remote nature of the attack vector makes it particularly concerning.
Apply the latest security updates for Cisco IOS XE Software to mitigate this BGP over EVPN vulnerability. Implement network hardening measures to restrict access to critical routing infrastructure.
Technical Analysis
CVE-2017-12319 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2017-12319 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2017-12319 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1