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CVE-2026-20039

A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7a29f4f31b9f802651c37f51748ebf644a27c0bd50c49be8d57ada2eac869905
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unknown","product":"Cisco Secure Firewall Threat Defense (FTD) Software","vendor":"Cisco","versions":[{"status":"affected","version":"6.4.0.1"},{"status":"affected","version":"6.4.0.2"},{"status":"affected","version":"6.4.0.5"},{"status":"affected","version":"6.4.0"},{"status":"affected","version":"6.4.0.3"},{"status":"affected","version":"6.4.0.4"},{"status":"affected","version":"6.4.0.6"},{"status":"affected","version":"6.4.0.7"},{"status":"affected","version":"6.4.0.8"},{"status":"affected","version":"6.4.0.9"},{"status":"affected","version":"6.4.0.10"},{"status":"affected…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ea139902d292790282c5d7cbcd1aae47220ad289b35b41657c6c3fbd1a403dc5 · sha256:281a592c38f3098b… · /containers/cna/affected/1

{"defaultStatus":"unknown","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","vendor":"Cisco","versions":[{"status":"affected","version":"9.12.3"},{"status":"affected","version":"9.12.1"},{"status":"affected","version":"9.12.2"},{"status":"affected","version":"9.12.4"},{"status":"affected","version":"9.12.3.2"},{"status":"affected","version":"9.12.3.7"},{"status":"affected","version":"9.12.2.5"},{"status":"affected","version":"9.12.3.12"},{"status":"affected","version":"9.12.1.3"},{"status":"affected","version":"9.12.2.4"},{"status":"affected","version":"9.12.1.2"},{…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ea139902d292790282c5d7cbcd1aae47220ad289b35b41657c6c3fbd1a403dc5 · sha256:281a592c38f3098b… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"unknown","product":"Cisco Secure Firewall Threat Defense (FTD) Software","vendor":"Cisco","versions":[{"status":"affected","version":"6.4.0.1"},{"status":"affected","version":"6.4.0.2"},{"status":"affected","version":"6.4.0.5"},{"status":"affected","version":"6.4.0"},{"status":"affected","version":"6.4.0.3"},{"status":"affected","version":"6.4.0.4"},{"status":"affected","version":"6.4.0.6"},{"status":"affected","version":"6.4.0.7"},{"status":"affected","version":"6.4.0.8"},{"status":"affected","version":"6.4.0.9"},{"status":"affected","version":"6.4.0.10"},{"status":"affected…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ea139902d292790282c5d7cbcd1aae47220ad289b35b41657c6c3fbd1a403dc5 · sha256:281a592c38f3098b… · /containers/cna/affected/1
{"defaultStatus":"unknown","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","vendor":"Cisco","versions":[{"status":"affected","version":"9.12.3"},{"status":"affected","version":"9.12.1"},{"status":"affected","version":"9.12.2"},{"status":"affected","version":"9.12.4"},{"status":"affected","version":"9.12.3.2"},{"status":"affected","version":"9.12.3.7"},{"status":"affected","version":"9.12.2.5"},{"status":"affected","version":"9.12.3.12"},{"status":"affected","version":"9.12.1.3"},{"status":"affected","version":"9.12.2.4"},{"status":"affected","version":"9.12.1.2"},{…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ea139902d292790282c5d7cbcd1aae47220ad289b35b41657c6c3fbd1a403dc5 · sha256:281a592c38f3098b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ea139902d292790282c5d7cbcd1aae47220ad289b35b41657c6c3fbd1a403dc5 · sha256:281a592c38f3098b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-244","description":"Improper Clearing of Heap Memory Before Release ('Heap Inspection')","lang":"en","type":"cwe"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ea139902d292790282c5d7cbcd1aae47220ad289b35b41657c6c3fbd1a403dc5 · sha256:281a592c38f3098b… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"cisco-sa-asaftd-vpn-dos-SpOFF2Re","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ea139902d292790282c5d7cbcd1aae47220ad289b35b41657c6c3fbd1a403dc5 · sha256:281a592c38f3098b… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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