Security readout for executives and security teams
Plain-English summary
CVE-2020-3304 can let an unauthenticated remote attacker crash affected Cisco ASA or FTD web services, forcing a device reload and causing downtime. The business risk is availability loss on security infrastructure, especially if management or web services are reachable from untrusted networks over IPv4 or IPv6.
Executive priority
Treat as high priority for perimeter and remote-access security devices because a successful attack can interrupt security services without authentication.
Technical view
The issue is improper input validation in the Cisco ASA and FTD web interface. A crafted HTTP request can trigger an unexpected reload, creating a denial-of-service condition. CVSS 3.0 is 8.6 with network access, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where Cisco ASA or FTD web interfaces are enabled and reachable from untrusted networks, including IPv4 or IPv6 paths. The bundle does not provide affected version ranges.
Exploitation context
The source bundle states unauthenticated remote exploitation is possible through crafted HTTP traffic. It does not provide evidence of active exploitation, and KEV status is false.
Researcher notes
The bundle supports denial of service via web interface input validation failure, but does not include affected version ranges, fixed release details, or compensating controls beyond Cisco advisory review.
Mitigation direction
- Review Cisco advisory for affected releases and fixed software guidance.
- Restrict web interface access to trusted administrative networks only.
- Check both IPv4 and IPv6 exposure for ASA or FTD web services.
- Prioritize remediation for internet-reachable or critical perimeter devices.
Validation and detection
- Inventory Cisco ASA and FTD devices with web interfaces enabled.
- Compare device software against Cisco advisory affected and fixed release guidance.
- Verify administrative HTTP/HTTPS access is not exposed to untrusted networks.
- Review device logs for unexpected reloads or availability events.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-3304 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.6HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20201021 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Denial of Service VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.