# CVE-2017-3883: Denial of service in n/a > Unauthenticated remote attackers can cause device reloads via brute-force login attacks on Cisco devices configured with AAA services. - **Severity:** High 8.6 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 19 Oct 2017 - **Updated:** 5 Aug 2024 - **Also known as:** GHSA-v65q-78qf-p4jg ## What is CVE-2017-3883? CVE-2017-3883 is a high-severity denial of service vulnerability in Cisco Firepower Extensible Operating System, published on 19 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A vulnerability in the authentication, authorization, and accounting (AAA) implementation of Cisco Firepower Extensible Operating System (FXOS) and NX-OS System Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability occurs because AAA processes prevent the NX-OS System Manager from receiving keepalive messages when an affected device receives a high rate of login attempts, such as in a brute-force login attack. System memory can run low on the FXOS devices under the same conditions, which could cause the AAA process to unexpectedly restart or cause the device to reload. An attacker could exploit this vulnerability by performing a brute-force login attack against a device that is configured with AAA security services. A successful exploit could allow the attacker to cause the affected device to reload. This vulnerability affects the following Cisco products if they are running Cisco FXOS or NX-OS System Software that is configured for AAA services: Firepower 4100 Series Next-Generation Firewall, Firepower 9300 Security Appliance, Multilayer Director Switches, Nexus 1000V Series Switches, Nexus 1100 Series Cloud Services Platforms, Nexus 2000 Series Switches, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 5000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Switches in NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, Unified Computing System (UCS) 6100 Series Fabric Interconnects, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCuq58760, CSCuq71257, CSCur97432, CSCus05214, CSCux54898, CSCvc33141, CSCvd36971, CSCve03660. Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling) ## Which versions are affected by CVE-2017-3883? It affects 3 products. Products: Cisco Firepower Extensible Operating System, Cisco Fxos, Cisco Nx-Os. ## How do I fix CVE-2017-3883? No fix has been published for CVE-2017-3883 yet. Limit exposure of the affected software until one is available. ## Is CVE-2017-3883 being exploited? There is no known exploitation of CVE-2017-3883 in the wild and no public exploit code. ## Other vulnerabilities in Cisco Firepower Extensible Operating System - [CVE-2018-0310](https://insights.sbomify.com/CVE-2018-0310/): Information disclosure in Cisco FXOS and NX-OS unknown (critical 9.8) - [CVE-2015-6435](https://insights.sbomify.com/CVE-2015-6435/): Command injection in n/a (critical 9.8) - [CVE-2021-1368](https://insights.sbomify.com/CVE-2021-1368/): Memory corruption in Cisco NX-OS Software (high 8.8) - [CVE-2020-3456](https://insights.sbomify.com/CVE-2020-3456/): Cisco FXOS Software Firepower Chassis Manager Cross-Site Request Forgery Vulnerability (high 8.8) - [CVE-2020-3172](https://insights.sbomify.com/CVE-2020-3172/): Cisco FXOS and NX-OS Software Cisco Discovery Protocol Arbitrary Code Execution and Denial of Service Vulnerability (high 8.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2017-3883 and fix it if it is affected. What it is: CVE-2017-3883 is a high-severity denial of service vulnerability in Cisco Firepower Extensible Operating System, published on 19 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2017-3883 in the wild and no public exploit code. Affected product: Cisco Firepower Extensible Operating System. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2017-3883/ (Markdown: https://insights.sbomify.com/CVE-2017-3883/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2017-3883 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-3883 - OSV: https://osv.dev/vulnerability/CVE-2017-3883 --- From sbomify Insights: https://insights.sbomify.com/CVE-2017-3883/ Summaries are generated and may contain mistakes; the official description above is the record.