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Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
CISA has added two new vulnerabilities to its known-exploited catalogue, based on evidence of active exploitation.
Confirm whether Cisco Secure Firewall Threat Defense is in your estate.
all High · vulnerabilities · exploited in the wild
Updated
CISA has added two new vulnerabilities to its known-exploited catalogue, based on evidence of active exploitation.
Next step: Confirm whether Cisco Secure Firewall Threat Defense is in your estate.
Who's reporting
1 of 3 perspectives
Official authority: Official 2Vendor statement missing. no VendorResearcher coverage missing. no Researcher2 signals
Only official coverage so far. Treat as an early signal.
CVE-2020-3259 is confirmed as exploited in the wild (US known-exploited catalogue) CVE-2020-3259 has an estimated ~71.8% chance of attack in 30 days (99.4th percentile) as of 2026-10-20 — probability…
Next step: Confirm whether Cisco Secure Firewall Threat Defense is in your estate.
Who's reporting
1 of 3 perspectives
Official authority: Official 1Vendor statement missing. no VendorResearcher coverage missing. no Researcher1 signal
Only official coverage so far. Treat as an early signal.
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