Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated remote attacker crash affected Cisco ASA or FTD firewalls by sending crafted MGCP packets through them. The business impact is service disruption: traffic that depends on the device can be interrupted when memory exhaustion forces a restart.
Executive priority
Treat this as high priority where affected Cisco firewalls support voice or gateway traffic paths. The primary risk is outage, not data theft, but firewall restarts can disrupt business connectivity and dependent services.
Technical view
CVE-2020-3254 affects Cisco ASA Software and FTD Software MGCP inspection. Inefficient memory management can be triggered by crafted MGCP packets traversing an affected device, causing memory exhaustion and device restart. CVSS is 8.6, network reachable, low complexity, no privileges, no user interaction, availability impact high.
Likely exposure
Exposure is most likely where Cisco ASA or FTD devices use MGCP inspection and process MGCP traffic. The provided bundle does not enumerate affected versions, so teams must confirm exposure against Cisco’s advisory and their deployed software inventory.
Exploitation context
The source bundle describes remote unauthenticated DoS potential, but does not cite public exploit activity. CISA KEV status is false, so active exploitation should not be assumed from these sources.
Researcher notes
Evidence supports CWE-400 resource exhaustion through MGCP inspection memory handling. The bundle lacks affected version detail, patch version detail, and exploit evidence. Avoid assuming broader protocol exposure beyond crafted MGCP packets traversing affected Cisco devices.
Mitigation direction
- Check Cisco’s advisory for fixed releases or workarounds before production changes.
- Prioritize vendor-recommended updates for affected ASA and FTD devices.
- Review whether MGCP inspection is enabled and operationally required.
- Monitor affected devices for memory exhaustion, unexpected restarts, and traffic disruption.
Validation and detection
- Inventory Cisco ASA and FTD deployments and software versions.
- Identify devices with MGCP inspection enabled or MGCP traffic traversing them.
- Compare deployed versions and configuration against Cisco’s advisory.
- Review logs and availability records for unexplained firewall restarts.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-3254 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
- 20200506 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Media Gateway Control Protocol Denial of Service VulnerabilitiesCVE 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.