Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated remote attacker bypass Cisco URL filtering and redirect users toward malicious sites. The business impact is mainly loss of filtering control and increased phishing or malware exposure, not direct appliance takeover based on the provided sources.
Executive priority
Treat as a moderate-priority control-bypass issue. Prioritize environments where Cisco URL filtering protects high-risk users, internet egress, or phishing defenses, but do not escalate as critical without exploitation or broader impact evidence.
Technical view
CVE-2020-3370 is an insufficient input validation issue in Cisco URL filtering. CVSS is 4.0 with network attack vector, high complexity, no privileges, changed scope, and low integrity impact. Sources describe Cisco Content Security Management Appliance, while the affected entry names Cisco Email Security Appliance, so confirm scope against Cisco’s advisory.
Likely exposure
Organizations using Cisco SMA or ESA URL filtering functions may be exposed. The provided bundle does not include exact vulnerable versions, so exposure depends on matching deployed appliance software against Cisco’s advisory.
Exploitation context
No CISA KEV listing is provided and the source bundle does not cite active exploitation. Exploitation is described as a crafted malicious HTTP request that can bypass filtering and redirect users, with high attack complexity in the CVSS vector.
Researcher notes
Key evidence is limited to the CVE record and Cisco advisory reference. Note the SMA versus ESA naming inconsistency in the bundle. CWE-20 and CVSS indicate input validation weakness with low integrity impact and no confidentiality or availability impact stated.
Mitigation direction
- Inventory Cisco SMA and ESA appliances that perform URL filtering.
- Check Cisco’s advisory for affected releases and fixed software.
- Apply vendor-recommended updates or mitigations when confirmed applicable.
- Review URL filtering policy placement and upstream controls.
- Monitor for unexpected redirects or filtering bypass reports.
Validation and detection
- Compare appliance product and version data with Cisco’s advisory.
- Confirm whether URL filtering is enabled and in traffic path.
- Review logs for anomalous redirect or filter-bypass patterns.
- After remediation, verify expected URL filtering behavior returns.
- Document any product-name ambiguity in the vulnerability record.
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-20: 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-2020-3370 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
- 4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
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:L/A:N2.21.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4MediumVector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20200715 Cisco Content Security Management Appliance Filter Bypass 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.