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PatchSiren cyber security CVE debrief

CVE-2020-3580 Cisco CVE debrief

CVE-2020-3580 is a cross-site scripting vulnerability affecting Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). CISA lists it in the Known Exploited Vulnerabilities catalog and marks it as associated with known ransomware campaign use, so defenders should treat it as a high-priority remediation item and follow Cisco's update guidance without delay.

Vendor
Cisco
Product
Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
CVSS
MEDIUM 6.1
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Cisco ASA and FTD administrators, network security teams, SOC and incident response staff, and patch-management owners should prioritize this issue, especially in environments that rely on Cisco edge or security appliances.

Technical summary

The supplied official metadata identifies CVE-2020-3580 as a cross-site scripting (XSS) vulnerability in Cisco ASA and FTD. The CISA KEV record shows it was added on 2021-11-03, with remediation due by 2022-05-03, and notes known ransomware campaign use. The corpus does not include affected versions, attack conditions, or deeper impact details, so authoritative technical specifics should be confirmed in Cisco's vendor guidance and the linked CVE/NVD records.

Defensive priority

Urgent

Recommended defensive actions

  • Apply Cisco updates per vendor instructions as soon as possible.
  • Inventory Cisco ASA and FTD deployments and confirm which systems are affected.
  • Use the official CVE and NVD records to verify technical and remediation details before scheduling maintenance.
  • Treat any still-unpatched instance as a high-priority remediation item because the vulnerability is in CISA's KEV catalog.
  • Track the issue in patch and risk-management workflows until remediation is confirmed.

Evidence notes

This debrief is intentionally limited to the supplied official metadata: the CVE title/description, CISA KEV entry, and official reference links. No affected versions, exploit mechanics, or CVSS score were provided in the corpus, so those details are not asserted here.

Sources and references

Verified primary and authoritative sources

  • CVE-2020-3580 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2020-3580

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2020-3580 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2020-3580

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.