What is CVE-2017-12232?

CVE-2017-12232 is a medium-severity vulnerability in Cisco 1000 Integrated Services Router, classified under CWE-399. CVSS score: 6.5/10. Published 2017-09-29.

How severe is CVE-2017-12232?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2017-12232 known to be exploited?

Yes. CVE-2017-12232 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Vulnerability in Cisco 1000 Integrated Services Router

CVE-2017-12232

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.

Published 2017-09-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.022 (81.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-399

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-03-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-03-24.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927… (Vendor Advisory)
www.securitytracker.com/id/1039452 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.securityfocus.com/bid/101044 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2017-12232?: CVE-2017-12232 is a medium-severity vulnerability in Cisco 1000 Integrated Services Router, classified under CWE-399. CVSS score: 6.5/10. Published 2017-09-29.
How severe is CVE-2017-12232?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2017-12232 known to be exploited?: Yes. CVE-2017-12232 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.