# What is CVE-2017-2343? > CVE-2017-2343 is a critical-severity flaw (CVSS 9.8) in Junos from Juniper, published on 17 July 2017. 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-2017-2343 ## 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:** 55 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:** 17 July 2017 - **Record last updated:** 20 April 2025 - **Main product:** Junos from Juniper - **Affected products:** 14 ## What is CVE-2017-2343? 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 The Integrated User Firewall (UserFW) feature was introduced in Junos OS version 12.1X47-D10 on the Juniper SRX Series devices to provide simple integration of user profiles on top of the existing firewall polices. As part of an internal security review of the UserFW services authentication API, hardcoded credentials were identified and removed which can impact both the SRX Series device, and potentially LDAP and Active Directory integrated points. An attacker may be able to completely compromise SRX Series devices, as well as Active Directory servers and services. When Active Directory is compromised, it may allow access to user credentials, workstations, servers performing other functions such as email, database, etc. Inter-Forest Active Directory deployments may also be at risk as the attacker may gain full administrative control over one or more Active Directories depending on the credentials supplied by the administrator of the AD domains and SRX devices performing integrated authentication of users, groups and devices. To identify if your device is potentially vulnerable to exploitation, check to see if the service is operating; from CLI review the following output: root@SRX-Firewall# run show services user-identification active-directory-access domain-controller status extensive A result of "Status: Connected" will indicate that the service is active on the device. To evaluate if user authentication is occurring through the device: root@SRX-Firewall# run show services user-identification active-directory-access active-directory-authentication-table all Next review the results to see if valid users and groups are returned. e.g. Domain: juniperlab.com Total entries: 3 Source IP Username groups state 172.16.26.1 administrator Valid 192.168.26.2 engg01 engineers Valid 192.168.26.3 guest01 guests Valid Domain: NULL Total entries: 8 Source IP Username groups state 192.168.26.4 Invalid 192.168.26.5 Invalid This will also indicate that Valid users and groups are authenticating through the device. Affected releases are Juniper Networks Junos OS 12.3X48 from 12.3X48-D30 and prior to 12.3X48-D35 on SRX series; 15.1X49 from 15.1X49-D40 and prior to 15.1X49-D50 on SRX series. Devices on any version of Junos OS 12.1X46, or 12.1X47 are unaffected by this issue. ### What kind of flaw is it? - CWE-798: Use of Hard-coded Credentials ### 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-2017-2343 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 - 17 July 2017: Published - 20 April 2025: Record last updated ### How Precursor Intelligence ranks it CVE-2017-2343 scores **55 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-2017-2343? The published record lists 14 products. - [Junos](https://www.precursorintelligence.com/product/juniper/junos) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Operating system): 12.3x48-d10, 12.3x48-d15, 12.3x48-d20, 12.3x48-d25, 12.3x48-d30, 12.3x48-d35, 15.1x49-d40, 15.1x49-d45 - [Srx100](https://www.precursorintelligence.com/product/juniper/srx100) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx110](https://www.precursorintelligence.com/product/juniper/srx110) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx1400](https://www.precursorintelligence.com/product/juniper/srx1400) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx210](https://www.precursorintelligence.com/product/juniper/srx210) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx220](https://www.precursorintelligence.com/product/juniper/srx220) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx240](https://www.precursorintelligence.com/product/juniper/srx240) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx3400](https://www.precursorintelligence.com/product/juniper/srx3400) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx3600](https://www.precursorintelligence.com/product/juniper/srx3600) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx5400](https://www.precursorintelligence.com/product/juniper/srx5400) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx550](https://www.precursorintelligence.com/product/juniper/srx550) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx5600](https://www.precursorintelligence.com/product/juniper/srx5600) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx5800](https://www.precursorintelligence.com/product/juniper/srx5800) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified - [Srx650](https://www.precursorintelligence.com/product/juniper/srx650) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified ## How do I fix CVE-2017-2343? 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 - [kb.juniper.net](https://kb.juniper.net/JSA10791) (Vendor advisory) - [securitytracker.com](http://www.securitytracker.com/id/1038904) (Third-party advisory, Vulnerability database) ## Questions ### What is CVE-2017-2343? CVE-2017-2343 is a critical-severity flaw in Junos from Juniper, published on 17 July 2017. 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-2017-2343? It scores 9.8 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2017-2343 is 55 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-2017-2343 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-2017-2343 affect? For Junos from Juniper: 12.3x48-d10, 12.3x48-d15, 12.3x48-d20, 12.3x48-d25, 12.3x48-d30, 12.3x48-d35 and 2 more. The record lists 14 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2017-2343? 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-2017-2343 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