Threats / Cisco / CVE-2017-12319
CVE-2017-12319
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Cisco IOS XE Software vulnerability
A BGP over EVPN vulnerability in Cisco IOS XE Software allows unauthenticated remote attackers to cause device reloads or corrupt routing tables, resulting in denial of service or network instability.
Verdict
Today item — known-exploited.
An unauthenticated remote attacker can exploit improper input validation in BGP EVPN processing to trigger device reloads or corrupt BGP routing state, causing denial of service and potential network disruption.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
2 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03).
Probability (EPSS)
EPSS 0.05367 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Cisco, IOS XE Software. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-20 Improper Input Validation.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft and send malformed BGP EVPN packets to a Cisco IOS XE device without authentication.
Business
Network availability is compromised as the device reloads or routing tables become corrupted, causing traffic loss and service interruption.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit the input validation weakness to inject invalid BGP route data into the routing table.
Business
Network stability deteriorates as incorrect routing information propagates, potentially misdirecting traffic or isolating network segments.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05