Threats / Cisco / CVE-2017-12233
CVE-2017-12233
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Cisco IOS software vulnerability
A vulnerability in Cisco IOS Common Industrial Protocol (CIP) implementation allows unauthenticated remote attackers to cause device reload, resulting in denial of service.
Verdict
Today item — known-exploited.
An unauthenticated remote attacker can send crafted CIP packets to an affected Cisco IOS device, triggering improper input validation that causes the device to reload and become unavailable.
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 0.06938 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Cisco, IOS 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 CIP protocol packets to the target device without authentication.
Business
The affected network device becomes unavailable, disrupting industrial control operations and connected services.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit the lack of input validation to trigger a crash condition in the CIP processing logic.
Business
Unplanned downtime occurs, potentially affecting production schedules and dependent infrastructure.
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