CVE-2017-3807: n/a Cisco ASA Software with Clientless SSL VPN…

CVE-2017-3807: A vulnerability in Common Internet Filesystem (CIFS) code in the Clientless SSL VPN functionality of Cisco...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 14:39 UTC (UTC+00:00)

Security readout for executives and security teams

This affects Cisco ASA firewalls running ASA Software 9.0 through 9.6 when the Clientless SSL VPN portal is enabled. A logged-in VPN user could trigger a memory corruption flaw that may crash the appliance or possibly run code. Business impact is highest where ASA provides internet-facing VPN or perimeter firewall services. Exposure is limited to Cisco ASA Software major releases 9.0-9.6 with Clientless SSL VPN enabled, in routed firewall mode, on listed ASA, ASAv, Firepower 9300, and Firepower 4100 deployments. Treat as a high-priority perimeter security issue if affected ASA appliances support remote access. The flaw can disrupt firewall/VPN availability and may allow code execution, but requires valid VPN portal credentials and specific configuration. Mitigation focus: Review Cisco advisory cisco-sa-20170208-asa for fixed releases and official workarounds.; Prioritize upgrades for internet-facing ASA VPN appliances matching affected versions and configuration.; Disable Clientless SSL VPN where it is not operationally required, following Cisco guidance..

Prepared: Jun 13, 2026, 06:20 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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CVE-2017-3807 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Feb 9, 2017, 17:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170208-asaCVE reference · x_refsource_CONFIRM
41369CVE reference · exploit, x_refsource_EXPLOIT-DB

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/aCisco ASA Software with Clientless SSL VPN portal is enabled Major Releases 9.0-9.6Cisco ASA Software with Clientless SSL VPN portal is enabled Major Releases 9.0-9.6Listed

Weakness

CWE details

CWE-119

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CWE-119 · source CWE mapping

Improper Restriction of Operations within the Bounds of a Memory Buffer

Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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