■ Executive Risk Command Center
CISA KEV
LISTED
Remediation due 2026-08-14
Affected
Secure Firewall Adaptive Securit
Exploitation confirmed? — YES — CISA KEV listed
Urgent remediation? — YES — follow the cited CISA/vendor action
CISA required action — Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage
⚡ CYBERDUDEBIVASH® SENTINEL APEX
Source-linked automated security intelligence with explicit evidence status and provenance.
🚨 CISA FEDERAL MANDATE — ACTIVE EXPLOITATION CONFIRMED
This vulnerability is actively exploited in the wild. Federal agencies face a legal remediation deadline. Enterprise organizations should treat this with equivalent urgency. CYBERDUDEBIVASH® provides rapid vulnerability assessment and remediation guidance.
🔍 CVE-2026-20349 | 📅 August 12, 2026 | 📂 CISA KEV | 🛡 CYBERDUDEBIVASH®
CISA KEV ALERT · UNRATED
CDB-CTI-2026-EAFAF0CEF191 · Generated 2026-08-12T10:08:22.159024Z
Executive Summary
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) contain a heap inspection vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. CISA has added CVE-2026-20349 (Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) ) to the Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies required to remediate by 2026-08-14. Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Decision: Validate relevance and exposure using the cited source and internal evidence before treating this record as an incident, confirmed compromise, or customer-specific finding.
Threat Classification and Evidence Status
Intelligence family
CISA KEV Alert
Technical severity
UNRATED
Exploitation
Confirmed — CISA KEV listed
Patch/remediation
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Verified Facts
Source type: CISA KEV Alert
Source publication time: 2026-08-11T00:00:00+00:00
CVE: CVE-2026-20349
Affected product: Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD)
Exploitation evidence: CISA KEV listed on 2026-08-11; federal due date 2026-08-14
Technical Analysis
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) contain a heap inspection vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. CISA has added CVE-2026-20349 (Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) ) to the Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies required to remediate by 2026-08-14. Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vulnerability class: Denial Of Service. Assessment: Active exploitation is confirmed by the cited evidence; prioritize exposure confirmation and the authoritative remediation action.
Exposure and Remediation Decisions
P0 — Inventory: Confirm the affected product and version against authoritative vendor/NVD data; prioritize internet-facing and business-critical assets.
P0 — Remediation: CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
P1 — Compensating controls: Restrict exposure, enforce least privilege, and apply vendor-supported mitigations when immediate remediation is not possible.
P1 — Retrospective review: Search only the telemetry relevant to the affected component and validated vulnerability class; absence of alerts does not prove absence of exploitation.
Source Evidence Extract
CVE ID: CVE-2026-20349
Vendor/Product: Cisco — Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD)
Vulnerability Name: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability
Date Added to KEV: 2026-08-11
Federal Remediation Deadline: 2026-08-14
Description: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) contain a heap inspection vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.
Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA Notes: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20349
This extract is escaped and rendered from the ingested source record; generated analysis is not presented as a source fact.
MITRE ATT&CK Mapping
Impact → Endpoint Denial of Service (T1499), only where service exhaustion is observed.
Mappings are conditional analytical aids, not claims that the technique occurred. Promote a mapping to observed only after telemetry confirms the behavior.
Detection Engineering
DETECTION STATUS: TELEMETRY_SPECIFICATION_ONLY
Availability-impact evidence does not justify a process-execution or web-shell rule.
Alert on affected-service crash/restart loops, saturation, latency, and request-rate anomalies against a measured baseline.
Correlate load-balancer, application, operating-system, and infrastructure metrics around the reported failure window.
Provenance and Review Status
Report IDCDB-CTI-2026-EAFAF0CEF191
Source systemcisa_kev
Source published2026-08-11T00:00:00+00:00
Source-record SHA-256eafaf0cef19165e94ee383cfabffb42a464823e00cc52d67d68e7ec3ea7d5de8
Generated UTC2026-08-12T10:08:22.159024Z
Review statusAutomated intelligence synthesis — not human reviewed
CertificationPublic reference draft — not a certified customer deliverable
Automated intelligence synthesis — not human reviewed. Public reference draft — not a certified customer deliverable. Customer-specific action requires exposure validation and accountable human approval.
🎯 Recommended For This Threat
Vulnerability AssessmentAPI · SaaS · Cloud · Web Security
Detection EngineeringVersioned Sigma · YARA · SIEM Content
SOC & MSSP ServicesCo-Managed SOC · Threat Hunting
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