How severe is CVE-2017-12232?

CVE-2017-12232 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2017-12232?

Affected package information for CVE-2017-12232 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2017-12232?

No fixed version has been published for CVE-2017-12232 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2017-12232 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2017-12232, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2017-12232?

CVE-2017-12232 has an EPSS (Exploit Prediction Scoring System) score of 1.4%, placing it in the 81th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2017-12232 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2017-12232 (Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-03-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-03-24. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2017-12232?

CVE-2017-12232 is classified as CWE-399 (CWE-399). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2017-12232?

CVE-2017-12232 affects cisco ios. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2017-12232 published, and has it been updated?

CVE-2017-12232 was published on September 29, 2017 and was last updated on April 22, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-03-03 — agencies required to remediate by 2022-03-24

CVE-2017-12232

MEDIUM

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,…

Published

Sep 29, 2017

Updated

Apr 22, 2026

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

1.4%probability of exploitation in next 30 days

Lower Risk81th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

1 product · 1 configurations

ioscisco

≥ 15.0 && ≤ 15.6

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A vulnerability in the implementation of a protocol in Cisco Integrated …

cisa.govAPIMar 2022

A vulnerability in the implementation of a protocol in Cisco Integrated …

cisa.govCISAMar 2022

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2017-12232 in your stack?

O3 detects CVE-2017-12232 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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