# What is CVE-2018-5459? > CVE-2018-5459 is a critical-severity flaw (CVSS 9.8) in Pfc200 from Wago, published on 13 February 2018. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 2.7%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2018-5459 ## At a glance - **Verdict:** Fix this soon. Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. - **Precursor Intelligence risk score:** 54 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** Critical (CVSS 9.8 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 2.7% (latest exploit-likelihood forecast) - **Published:** 13 February 2018 - **Record last updated:** 9 October 2019 - **Main product:** Pfc200 from Wago - **Affected products:** 19 ## What is CVE-2018-5459? In plain terms It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### The official description An Improper Authentication issue was discovered in WAGO PFC200 Series 3S CoDeSys Runtime versions 2.3.X and 2.4.X. An attacker can execute different unauthenticated remote operations because of the CoDeSys Runtime application, which is available via network by default on Port 2455. An attacker could execute some unauthenticated commands such as reading, writing, or deleting arbitrary files, or manipulate the PLC application during runtime by sending specially-crafted TCP packets to Port 2455. ### What kind of flaw is it? - CWE-287: Improper Authentication ### How an attack on it works - Where an attacker can be: Anywhere on the internet - How hard it is to pull off: Easy: no special conditions - Login needed first: No login needed - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can read data, change data and take it offline Severity vector: `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` ## Is CVE-2018-5459 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 2.7%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 2.7%, 2.7%, 2.7%, 2.7%, 2.7%, 2.7%, 2.7%. ### Timeline - 13 February 2018: Published - 9 October 2019: Record last updated ### How Precursor Intelligence ranks it CVE-2018-5459 scores **54 out of 100 (Medium)**, with the action "Plan remediation". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: smaller factor - Threat activity around it: smaller factor 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2018-5459? The published record lists 19 products. Versions are as published: "before 02.07.07(10)" means every version up to, but not including, 02.07.07(10). - [Pfc200](https://www.precursorintelligence.com/product/wago/pfc200) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - [750-8202](https://www.precursorintelligence.com/product/wago/750-8202) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8202/025-000 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8202/025-001 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8202/025-002 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8202/040-001 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - [750-8203](https://www.precursorintelligence.com/product/wago/750-8203) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8203/025-000 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - [750-8204](https://www.precursorintelligence.com/product/wago/750-8204) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8204/025-000 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - [750-8206](https://www.precursorintelligence.com/product/wago/750-8206) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8206/025-000 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8206/025-001 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - [750-8207](https://www.precursorintelligence.com/product/wago/750-8207) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8207/025-000 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8207/025-001 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - [750-8208](https://www.precursorintelligence.com/product/wago/750-8208) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - 750-8208/025-000 by [Wago](https://www.precursorintelligence.com/vendors/wago) (Hardware): version not specified - [Pfc200 Firmware](https://www.precursorintelligence.com/product/wago/pfc200_firmware) by [Wago](https://www.precursorintelligence.com/vendors/wago) (Operating system): before 02.07.07(10) ## How do I fix CVE-2018-5459? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the latest update from the vendor. The references list where the vendor has published details. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [ics-cert.us-cert.gov](https://ics-cert.us-cert.gov/advisories/ICSA-18-044-01) (Third-party advisory, Government resource) ## Questions ### What is CVE-2018-5459? CVE-2018-5459 is a critical-severity flaw in Pfc200 from Wago, published on 13 February 2018. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### How serious is CVE-2018-5459? It scores 9.8 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2018-5459 is 54 out of 100, which is Medium. Its action is "Plan remediation". Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. ### Is CVE-2018-5459 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 2.7%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2018-5459 affect? For Pfc200 from Wago: version not specified. The record lists 19 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2018-5459? Install the update the vendor names in its advisory. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2018-5459 affect you? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact