Threats / Cisco / CVE-2017-6627
CVE-2017-6627
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Cisco IOS and XE Software vulnerability
A UDP processing vulnerability in Cisco IOS and IOS XE allows unauthenticated remote attackers to cause denial of service by wedging interface input queues with UDP packets.
Verdict
Today item — known-exploited.
Unauthenticated remote attackers can trigger a queue wedge condition on affected Cisco devices by sending crafted UDP traffic, resulting in interface unavailability and network disruption without requiring authentication or user interaction.
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 0.06042 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Cisco, IOS and IOS XE Software. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-399 Resource Management Errors — weakness family: Resource / availability.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 send malformed or excessive UDP packets to the target device to exploit the UDP processing flaw.
Business
Network interfaces become unresponsive, causing loss of connectivity and service availability for critical infrastructure.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I observe the input queue wedging and confirm the denial of service condition persists across the affected interface.
Business
Operational teams must perform emergency device resets or failovers, incurring unplanned downtime and response costs.
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