How severe is CVE-2017-12234?

CVE-2017-12234 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2017-12234?

Affected package information for CVE-2017-12234 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2017-12234?

No fixed version has been published for CVE-2017-12234 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-2017-12234 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2017-12234, 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-2017-12234?

CVE-2017-12234 has an EPSS (Exploit Prediction Scoring System) score of 11.3%, placing it in the 94th 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 warrants monitoring and prompt remediation.

Is CVE-2017-12234 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2017-12234 (Cisco IOS Software Common Industrial Protocol Request 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-2017-12234?

CVE-2017-12234 is classified as Improper Input Validation (CWE-20). 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-2017-12234?

CVE-2017-12234 affects cisco ios. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2017-12234 published, and has it been updated?

CVE-2017-12234 was published on September 29, 2017 and was last updated on April 21, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2017-12234: IOS Improper Input Validation (High 7.5)

EPSS Exploitation Probability

via FIRST.org ↗

11.3%probability of exploitation in next 30 days

Moderate Risk94th 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

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted CIP packets to be processed by 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: CSCvc43709.

Affected Products

1 product · 1 configurations

OS

ioscisco

≥ 12.4 && ≤ 15.6

range

Frequently Asked Questions

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted CIP packets to be processed by an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS conditi

O3 Security · Impact-Aware SCA

Is CVE-2017-12234 in your stack?

O3 detects CVE-2017-12234 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works