# What is CVE-2017-3882? > CVE-2017-3882 is a critical-severity flaw (CVSS 9.6) in Small Business RV Router Firmware from Cisco, published on 16 May 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 1.8%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.edgeprotect.io/what-is/cve-2017-3882 ## 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. - **EdgeProtect risk score:** 54 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** Critical (CVSS 9.6 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:** 1.8% (latest exploit-likelihood forecast) - **Published:** 16 May 2017 - **Record last updated:** 20 April 2025 - **Main product:** Small Business RV Router Firmware from Cisco - **Affected products:** 17 ## What is CVE-2017-3882? In plain terms An attacker has to be on the same local network 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 A vulnerability in the Universal Plug-and-Play (UPnP) implementation in the Cisco CVR100W Wireless-N VPN Router could allow an unauthenticated, Layer 2-adjacent attacker to execute arbitrary code or cause a denial of service (DoS) condition. The remote code execution could occur with root privileges. The vulnerability is due to incomplete range checks of the UPnP input data, which could result in a buffer overflow. An attacker could exploit this vulnerability by sending a malicious request to the UPnP listening port of the targeted device. An exploit could allow the attacker to cause the device to reload or potentially execute arbitrary code with root privileges. This vulnerability affects all firmware releases of the Cisco CVR100W Wireless-N VPN Router prior to Firmware Release 1.0.1.22. Cisco Bug IDs: CSCuz72642. ### What kind of flaw is it? - CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer ### How an attack on it works - Where an attacker can be: On the same local network - 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:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H` ## Is CVE-2017-3882 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 1.8%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 1.8%, 1.8%, 1.8%, 1.8%, 1.8%, 1.8%, 1.8%. ### Timeline - 16 May 2017: Published - 20 April 2025: Record last updated ### How EdgeProtect ranks it CVE-2017-3882 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: key context - Real threat activity around it: key context 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-2017-3882? The published record lists 17 products. - [Small Business RV Router Firmware](https://www.edgeprotect.io/product/cisco/small_business_rv_router_firmware) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Application): 1.0.0.30, 1.0.1.9, 1.0.1.19, 1.0.2.6, 1.0.3.10, 1.0.4.10, 1.0.4.14, 1.0.5.4(gd), 1.0.5.4, 1.0.5.5, 1.0.5.6, 1.0.5.8, 1.0.6.6, 1.0.39 - [Rv042](https://www.edgeprotect.io/product/cisco/rv042) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv042g](https://www.edgeprotect.io/product/cisco/rv042g) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv082](https://www.edgeprotect.io/product/cisco/rv082) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv110w](https://www.edgeprotect.io/product/cisco/rv110w) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv130](https://www.edgeprotect.io/product/cisco/rv130) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv130 Wf](https://www.edgeprotect.io/product/cisco/rv130_wf) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv130w](https://www.edgeprotect.io/product/cisco/rv130w) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv130w Wf](https://www.edgeprotect.io/product/cisco/rv130w_wf) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv132w](https://www.edgeprotect.io/product/cisco/rv132w) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv134w](https://www.edgeprotect.io/product/cisco/rv134w) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv215w](https://www.edgeprotect.io/product/cisco/rv215w) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv320](https://www.edgeprotect.io/product/cisco/rv320) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv320 Wf](https://www.edgeprotect.io/product/cisco/rv320_wf) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv325](https://www.edgeprotect.io/product/cisco/rv325) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Rv325 Wf](https://www.edgeprotect.io/product/cisco/rv325_wf) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Hardware): version not specified - [Small Business RV Router Firmware 1.0](https://www.edgeprotect.io/product/cisco/small_business_rv_router_firmware_1.0) by [Cisco](https://www.edgeprotect.io/vendors/cisco) (Application): 0.2 ## How do I fix CVE-2017-3882? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? EdgeProtect 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 - [tools.cisco.com](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-cvr100w1) (Vendor advisory) - [securityfocus.com](http://www.securityfocus.com/bid/98287) (Third-party advisory, Vulnerability database) - [securitytracker.com](http://www.securitytracker.com/id/1038391) ## Questions ### What is CVE-2017-3882? CVE-2017-3882 is a critical-severity flaw in Small Business RV Router Firmware from Cisco, published on 16 May 2017. An attacker has to be on the same local network 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-2017-3882? It scores 9.6 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2017-3882 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-2017-3882 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 1.8%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2017-3882 affect? For Small Business RV Router Firmware from Cisco: 1.0.0.30, 1.0.1.9, 1.0.1.19, 1.0.2.6, 1.0.3.10, 1.0.4.10 and 8 more. The record lists 17 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2017-3882? 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-2017-3882 affect you? EdgeProtect 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. 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