# CVE-2017-3807: Memory corruption in Cisco ASA Software with Clientless SSL VPN portal is enabled Major Releases 9.0-9.6 > Authenticated remote attackers can trigger a heap overflow in Cisco ASA Clientless SSL VPN via crafted URLs, potentially causing system reloads or code execution. - **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 9 Feb 2017 - **Updated:** 5 Aug 2024 - **Also known as:** GHSA-77g6-4h48-g6wv ## What is CVE-2017-3807? CVE-2017-3807 is a high-severity memory corruption vulnerability in Cisco Adaptive Security Appliance Software, published on 9 Feb 2017. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description A vulnerability in Common Internet Filesystem (CIFS) code in the Clientless SSL VPN functionality of Cisco ASA Software, Major Releases 9.0-9.6, could allow an authenticated, remote attacker to cause a heap overflow. The vulnerability is due to insufficient validation of user supplied input. An attacker could exploit this vulnerability by sending a crafted URL to the affected system. An exploit could allow the remote attacker to cause a reload of the affected system or potentially execute code. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed firewall mode only and in single or multiple context mode. This vulnerability can be triggered by IPv4 or IPv6 traffic. A valid TCP connection is needed to perform the attack. The attacker needs to have valid credentials to log in to the Clientless SSL VPN portal. Vulnerable Cisco ASA Software running on the following products may be affected by this vulnerability: Cisco ASA 5500 Series Adaptive Security Appliances, Cisco ASA 5500-X Series Next-Generation Firewalls, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco ASA for Firepower 9300 Series, Cisco ASA for Firepower 4100 Series. Cisco Bug IDs: CSCvc23838. Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) ## Which versions are affected by CVE-2017-3807? It affects 1 product. Products: Cisco Adaptive Security Appliance Software. ## How do I fix CVE-2017-3807? No fix has been published for CVE-2017-3807 yet. Limit exposure of the affected software until one is available. ## Is CVE-2017-3807 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-3807 exists. Public exploit code: - Cisco ASA - WebVPN CIFS Handling Buffer Overflow (exploitdb) ## Other vulnerabilities in Cisco Adaptive Security Appliance Software - [CVE-2025-20333](https://insights.sbomify.com/CVE-2025-20333/): Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow (critical 9.9, exploited in the wild) - [CVE-2016-6366](https://insights.sbomify.com/CVE-2016-6366/): Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow (high 8.8, exploited in the wild) - [CVE-2026-20349](https://insights.sbomify.com/CVE-2026-20349/): Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection (high 8.6, exploited in the wild) - [CVE-2024-20353](https://insights.sbomify.com/CVE-2024-20353/): Cisco ASA and FTD Denial of Service (high 8.6, exploited in the wild) - [CVE-2016-6367](https://insights.sbomify.com/CVE-2016-6367/): Cisco Adaptive Security Appliance (ASA) CLI Remote Code Execution (high 7.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2017-3807 and fix it if it is affected. What it is: CVE-2017-3807 is a high-severity memory corruption vulnerability in Cisco Adaptive Security Appliance Software, published on 9 Feb 2017. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-3807 exists. Affected product: Cisco Adaptive Security Appliance Software. 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-2017-3807/ (Markdown: https://insights.sbomify.com/CVE-2017-3807/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2017-3807 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-3807 - OSV: https://osv.dev/vulnerability/CVE-2017-3807 --- From sbomify Insights: https://insights.sbomify.com/CVE-2017-3807/ Summaries are generated and may contain mistakes; the official description above is the record.