Security readout for executives and security teams
Plain-English summary
This flaw can make affected Cisco ASA and Firepower Threat Defense devices reload after receiving malformed OSPFv2 traffic. The business impact is availability: perimeter or routing security devices could briefly fail or flap, disrupting network access. The source bundle does not provide affected version details or evidence of active exploitation.
Executive priority
Treat as high priority for networks where ASA or FTD participates in OSPFv2. The main risk is service interruption on security infrastructure, not data theft. Prioritize externally or broadly reachable routing adjacencies first.
Technical view
CVE-2020-3528 is an unauthenticated remote denial-of-service issue in Cisco ASA and FTD OSPFv2 processing. Incomplete validation of OSPFv2 packets containing Link-Local Signaling data can trigger a device reload. CVSS 3.1 is 8.6, with network attack vector, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where Cisco ASA or FTD devices process OSPFv2 traffic reachable by an attacker. Exact affected releases are not included in the provided bundle, so inventory must be checked against Cisco’s advisory.
Exploitation context
The bundle describes a malformed OSPFv2 packet causing reload, but provides no public exploit status. It is not listed as CISA KEV in the provided data, so active exploitation should not be assumed.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory reference. The source bundle names OSPFv2 LLS input validation and reload impact, but not affected version ranges, fixed releases, workarounds, or exploit observations.
Mitigation direction
- Check Cisco’s advisory for affected releases and fixed software guidance.
- Apply Cisco-recommended updates if your release is affected.
- Limit OSPFv2 traffic reachability to trusted routing peers where feasible.
- Monitor ASA and FTD devices for unexpected reloads or routing instability.
Validation and detection
- Inventory Cisco ASA and FTD devices running OSPFv2.
- Compare installed software versions against Cisco’s advisory.
- Review logs for unexplained reloads near OSPF events.
- Confirm routing controls restrict untrusted OSPFv2 traffic paths.
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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Open ATT&CK lookupCVE-2020-3528 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/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 OSPFv2 Link-Local Signaling 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.