CVE-2017-12319: in the CISA KEV catalogue

Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability. CISA added CVE-2017-12319 to the Known Exploited Vulnerabilities catalogue on 2022-03-03 with a default due date of 2022-03-24. Known ransomware campaign use: Unknown. Forensic triage flag: No.

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 description)

Vendor / product: Cisco IOS XE Software
CWE: CWE-20
CISA required action: Apply updates per vendor instructions.
EPSS: 5.2%, percentile 92 (scored 2026-11-03)

EPSS puts about 5.2 in 100 odds (5.2%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 92% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

https://nvd.nist.gov/vuln/detail/CVE-2017-12319

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.03, released 2026-11-03, 1,767 entries (checked 2026-11-03). EPSS model v2026.06.15, scored 2026-11-03, 399,388 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2017-12319 in the CISA KEV catalogue?

Yes. CISA added CVE-2017-12319 (Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-03-03. CISA's default due date for it is 2022-03-24.

Is CVE-2017-12319 used in ransomware attacks?

CISA marks known ransomware campaign use as Unknown for CVE-2017-12319. That means CISA lacks confirmation, not that ransomware groups do not use it.

What should I do about CVE-2017-12319?

CISA's required action: Apply updates per vendor instructions.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2017-12319