CVE-2017-12232

6.5 MEDIUM 2% exploit odds exploited in the wild Fix listed Denial of service Network gear

What it is

A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS 15.0 through 15.6 could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a misclassification of Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvc03809.

At a glance

Exploitability: Can be exploited from the same network segment without logging in. High risk of service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2017-08-03 00:00 UTC ReservedThe CVE id was reserved by its CNA
2017-09-29 01:34 UTC PublishedDisclosed publicly on CVE.org and NVD
2022-03-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2022-03-24 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 01:02 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 2.2% in the next 30 days (EPSS).
Severity: 6.5 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2017-09-29 01:34 UTC
Last modified: 2026-06-17 01:02 UTC
Added to CISA KEV: 2022-03-03
Exploit probability: 2.2% · EPSS, next 30 days
Weakness: CWE-399
Record status: Analyzed

Affected

Cisco iOS ≤ 15.6

Attack profile CVSS 3.1 · 6.5

Attack vector: Adjacent network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record