Security readout for executives and security teams
Plain-English summary
This is a browser-based attack risk in Cisco ASA and FTD web services. An attacker must trick a user into opening a crafted link. If successful, script runs in that user’s browser session and may read sensitive browser-accessible information. The bundle does not show active exploitation.
Executive priority
Treat as a moderate-priority perimeter appliance issue. It is not described as actively exploited and requires user interaction, but VPN and firewall portals are high-value targets. Prioritize verification for internet-facing Cisco ASA and FTD deployments.
Technical view
CVE-2020-3582 is a CWE-79 cross-site scripting issue in Cisco ASA and FTD web services caused by insufficient validation of user-supplied input. It is network-reachable, requires no attacker privileges, but requires user interaction. CVSS v3.1 is 6.1 with low confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure is most likely on Cisco ASA or FTD deployments using affected WebVPN or AnyConnect web services configurations. The source bundle says only specific configurations are affected, but does not provide version or configuration details beyond pointing to Cisco’s advisory.
Exploitation context
The described attack requires persuading a user of the web services interface to click a crafted link. There is no CISA KEV listing in the bundle and no cited evidence of active exploitation. Successful exploitation affects the browser context, not direct device availability.
Researcher notes
The bundle lacks detailed affected versions, fixed releases, and workaround text. Analysis is therefore limited to the CVE record summary and Cisco advisory reference. Do not assume all ASA or FTD deployments are affected; the source states only specific AnyConnect and WebVPN configurations are impacted.
Mitigation direction
- Review Cisco’s advisory for affected configurations, fixed releases, and listed workarounds.
- Upgrade affected ASA or FTD software according to Cisco guidance.
- Limit exposure of WebVPN and AnyConnect portals where operationally possible.
- Warn administrators and VPN users about unsolicited links targeting security appliance portals.
- Monitor Cisco guidance for any updates to affected versions or mitigations.
Validation and detection
- Inventory Cisco ASA and FTD devices and identify WebVPN or AnyConnect web services usage.
- Compare deployed software and configurations against Cisco’s advisory.
- Confirm whether the web services interface is reachable from untrusted networks.
- Review logs for suspicious requests to web services interface paths.
- Verify remediation by rechecking versions and affected configuration status.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2020-3582 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20201021 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting 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.