Security readout for executives and security teams
Plain-English summary
This flaw can let a remote unauthenticated attacker crash or disrupt affected Cisco ASA or Firepower Threat Defense devices by sending specially crafted BGP traffic. The business risk is service interruption on security edge devices, not data theft or privilege gain based on the provided sources.
Executive priority
Handle as a moderate availability risk. Prioritize devices supporting critical connectivity or perimeter routing, because successful exploitation could interrupt network security and routing services even though confidentiality and integrity impacts are not described.
Technical view
CVE-2020-3305 is a BGP module denial-of-service issue caused by incorrect processing of certain BGP packets in Cisco ASA Software and Cisco FTD Software. CVSS 3.0 is 6.8 with network attack vector, high attack complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where Cisco ASA or FTD devices run BGP and can receive BGP packets from reachable network peers. The provided bundle does not identify exact vulnerable versions, configurations, or fixed releases.
Exploitation context
The source bundle describes crafted BGP packets causing DoS. It does not cite public exploitation, proof-of-concept availability, or CISA KEV listing. Treat active exploitation as unconfirmed from the supplied evidence.
Researcher notes
The key evidence gap is version and fix detail: the bundle names Cisco ASA and FTD but only lists ASA in the affected array and provides no version matrix. Use the Cisco advisory as the authoritative source for affected releases and remediation.
Mitigation direction
- Review Cisco’s advisory for affected releases and vendor-approved fixed software.
- Inventory Cisco ASA and FTD devices that run BGP.
- Prioritize remediation for internet-edge or business-critical routing paths.
- Remove unnecessary BGP exposure using existing approved network controls.
- Monitor vendor guidance if fixed-version details are unclear locally.
Validation and detection
- Confirm whether each ASA or FTD device has BGP enabled.
- Compare running software versions against Cisco’s advisory.
- Review logs for unexplained BGP resets or device reloads.
- Verify business-critical paths have failover during remediation.
- Document devices not running BGP as lower exposure.
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-2020-3305 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
- Medium
- CVSS
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/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:H/PR:N/UI:N/S:C/C:N/I:N/A:H2.24Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AV:N/AC:H/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 BGP 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.