Coverage › CVE-2025-20333
CVE-2025-20333 Unmapped
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
- Vendor / product
- Cisco — Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
- Description (CISA)
- Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362.
- Added to KEV
- 2025-09-25 — after the latest CTID mapping snapshot (2025-07-28)
- Due date
- 2025-09-26
- Required action
- The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
- Known ransomware use
- Unknown
- CWE
- CWE-120
- CISA notes
- CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices
https://www.cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions
https://www.cisa.gov/eviction-strategies-tool/create-from-template
https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks
https://sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks#Details
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB
https://nvd.nist.gov/vuln/detail/CVE-2025-20333 - Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2025-20333. This entry was added to KEV on 2025-09-25, after that snapshot; of the 283 entries added since, 0 have a mapping. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE (CWE-120) — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.
Sigma rules tagged with this CVE
1 rule in SigmaHQ carries the tag cve.2025-20333. These are shown as detection content for the CVE itself. Their ATT&CK tags are deliberately not rendered here: a rule author's tag is not an authoritative statement of how the vulnerability is exploited, and this page does not show techniques for unmapped entries.