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PatchSiren cyber security CVE debrief

CVE-2017-3814 Cisco CVE debrief

CVE-2017-3814 is a Cisco URL bypass issue that could let an unauthenticated remote attacker evade web-content blocking controls on affected Firepower software. NVD rates it CVSS 5.8 (Medium), with network reachability and no authentication required, so organizations that depend on Cisco URL filtering should treat it as a control-enforcement weakness rather than a code-execution event.

Vendor
Cisco
Product
Secure Firewall Management Center
CVSS
MEDIUM 5.8
CISA KEV
Not listed in stored evidence
Original CVE published
2017-02-03
Original CVE updated
2026-05-13
Advisory published
2017-02-03
Advisory updated
2026-05-13

Who should care

Cisco administrators and security teams running affected Firepower System Software or the Secure Firewall Management Center versions listed by NVD, especially environments that rely on URL filtering or web content blocking for policy enforcement.

Technical summary

The published description states that a remote, unauthenticated attacker could maliciously bypass the appliance's ability to block certain web content (a URL bypass). NVD maps the issue to Cisco Secure Firewall Management Center CPEs for versions 5.3.0, 5.4.0, 6.0.0, 6.0.1, and 6.1.0, and assigns CWE-20 (Improper Input Validation). The CVSS v3.0 vector is AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N, indicating a network-reachable issue with limited confidentiality impact and no integrity or availability impact in the base score.

Defensive priority

Medium. Prioritize if your environment uses Cisco content-filtering or URL-blocking policy as a security control, because the impact is policy bypass rather than service disruption.

Recommended defensive actions

  • Check whether any deployed Cisco Firepower or Secure Firewall Management Center systems match the affected versions listed by NVD.
  • Review the Cisco security advisory and apply Cisco's recommended fixed release or mitigation guidance for your deployed product branch.
  • Validate that URL filtering and web-content blocking policies still enforce as expected after remediation.
  • Review logs and policy exceptions for evidence of unexpected URL access that may indicate control bypass behavior.
  • If immediate patching is not possible, apply compensating controls documented by Cisco and restrict exposure of administrative and management interfaces where appropriate.

Evidence notes

This debrief is based on the CVE description, NVD metadata, and Cisco references supplied in the source corpus. The key evidence points are: unauthenticated remote URL bypass; affected versions 5.3.0, 5.4.0, 6.0.0, 6.0.1, and 6.1.0; CVSS 5.8/Medium; CVSS vector AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N; and CWE-20. Published date used for timing context is 2017-02-03, with NVD last modified on 2026-05-13.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-3814 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-3814

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2017-3814 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-3814

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.