Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated attacker on an adjacent network crash affected Cisco SD-WAN vEdge routers. A successful attack causes the device to reboot, creating network outage risk. The supplied sources do not show confirmed active exploitation.
Executive priority
Treat this as a high-priority availability risk for SD-WAN environments. It is not described as data theft or privilege escalation, but router reboots can disrupt business connectivity and branch operations.
Technical view
CVE-2020-3385 is a high-severity DoS issue in the Cisco SD-WAN vEdge router DPI engine. Insufficient handling of malformed packets can allow an adjacent, unauthenticated attacker to trigger a reboot. CVSS 3.0 is 7.4 with availability impact only.
Likely exposure
Exposure is most likely in organizations operating Cisco SD-WAN vEdge routers reachable from adjacent network paths. The bundle does not provide affected version ranges or CPEs, so teams must validate against Cisco’s advisory and their device inventory.
Exploitation context
The CVE record describes exploitation by crafted packets traversing an affected device, but it requires adjacent network access. The bundle marks KEV as false and provides no cited evidence of active exploitation.
Researcher notes
Key constraints are adjacent attack vector, low complexity, no privileges, no user interaction, changed scope, and high availability impact. CWE-371 is listed. The source bundle lacks version-level affected and fixed-release detail, so vendor advisory review is required.
Mitigation direction
- Inventory Cisco SD-WAN vEdge routers in production and edge networks.
- Review Cisco’s advisory for affected releases, fixed software, and vendor workarounds.
- Prioritize upgrades or mitigations for devices supporting critical WAN paths.
- Restrict unnecessary adjacent network access to router-facing segments where feasible.
- Monitor affected devices for unexpected reboots or repeated availability events.
Validation and detection
- Compare deployed vEdge software versions against Cisco’s advisory criteria.
- Confirm whether vulnerable vEdge routers sit on critical or exposed adjacent segments.
- Review router and monitoring logs for unexplained reboots or DPI-related crashes.
- Verify post-remediation devices no longer match affected advisory conditions.
- Document residual exposure where upgrades are delayed.
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-371: 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-2020-3385 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
- 7.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/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:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H2.84Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.4HighVector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200715 Cisco SD-WAN vEdge Routers 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.
State Issues
State Issues represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.