# What is CVE-2018-4842? > CVE-2018-4842 is a medium-severity flaw (CVSS 4.8) in Scalance X200irt Firmware from Siemens, published on 14 June 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 0.8%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2018-4842 ## At a glance - **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle. - **Precursor Intelligence risk score:** 18 out of 100 (Info); action: Track. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 4.8 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:** 0.8% (latest exploit-likelihood forecast) - **Published:** 14 June 2018 - **Record last updated:** 13 December 2022 - **Main product:** Scalance X200irt Firmware from Siemens - **Affected products:** 6 ## What is CVE-2018-4842? In plain terms It can be attacked from anywhere on the internet with an administrator account, but a person has to take an action first. If it works, the attacker can read some data and change some data. ### The official description A vulnerability has been identified in SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) (All versions < V5.4.1), SCALANCE X-200RNA switch family (All versions < V3.2.7), SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) (All versions < V4.1.3). A remote, authenticated attacker with access to the configuration web server could be able to store script code on the web site, if the HRP redundancy option is set. This code could be executed in the web browser of victims visiting this web site (XSS), affecting its confidentiality, integrity and availability. User interaction is required for successful exploitation, as the user needs to visit the manipulated web site. At the stage of publishing this security advisory no public exploitation is known. The vendor has confirmed the vulnerability and provides mitigations to resolve it. ### What kind of flaw is it? - CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') ### 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: An administrator account - Does someone have to click: Yes, a person has to take an action - What an attacker gets: Can read some data and change some data Severity vector: `CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N` ## Is CVE-2018-4842 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 0.8%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.8%, 0.8%, 0.8%, 0.8%, 0.8%, 0.8%, 0.8%. ### Timeline - 14 June 2018: Published - 13 December 2022: Record last updated ### How Precursor Intelligence ranks it CVE-2018-4842 scores **18 out of 100 (Info)**, with the action "Track". 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-2018-4842? The published record lists 6 products. Versions are as published: "before 5.4.1" means every version up to, but not including, 5.4.1. - [Scalance X200irt Firmware](https://www.precursorintelligence.com/product/siemens/scalance_x200irt_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 5.4.1 - [Scalance X200](https://www.precursorintelligence.com/product/siemens/scalance_x200) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance X200 Firmware](https://www.precursorintelligence.com/product/siemens/scalance_x200_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 5.2.3 - [Scalance X200 Irt](https://www.precursorintelligence.com/product/siemens/scalance_x200_irt) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance X300](https://www.precursorintelligence.com/product/siemens/scalance_x300) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance X300 Firmware](https://www.precursorintelligence.com/product/siemens/scalance_x300_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified ## How do I fix CVE-2018-4842? 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 update named in the vendor’s advisory. We’ve put the advisory first in the list. 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 - [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-480829.pdf) (Mitigation, Vendor advisory) - [securityfocus.com](https://www.securityfocus.com/bid/104494) ## Questions ### What is CVE-2018-4842? CVE-2018-4842 is a medium-severity flaw in Scalance X200irt Firmware from Siemens, published on 14 June 2018. It can be attacked from anywhere on the internet with an administrator account, but a person has to take an action first. If it works, the attacker can read some data and change some data. ### How serious is CVE-2018-4842? It scores 4.8 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2018-4842 is 18 out of 100, which is Info. Its action is "Track". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2018-4842 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 0.8%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2018-4842 affect? For Scalance X200irt Firmware from Siemens: before 5.4.1. The record lists 6 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2018-4842? Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2018-4842 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