Cisco Firepower Threat Defense ↗
Summary iPlain-English security verdict for Cisco Firepower Threat Defense, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
Cisco Firepower Threat Defense currently scores 0/100 — critical, with active exploitation. 10 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2021-44228. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
Disclosure trend iNew CVEs published for Cisco Firepower Threat Defense each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
3 of its known vulnerabilities are linked to ransomware campaigns (CISA KEV).
Patch priority — what to act on iThe issues to fix first — actively exploited (CISA KEV) first, then by exploitation probability (EPSS), then severity. Each row's "→ fixed in" is the earliest version that patches it; "see advisory" means no fixed version is published.
Most urgent first — actively exploited, then likeliest to be exploited.
CVE-2021-44228 CRITICAL exploited ransomware Improper input validation EPSS 100% → see advisory CVE-2023-44487 HIGH exploited Uncontrolled resource consumption EPSS 100% → fixed in 7.4.2 CVE-2020-3452 HIGH exploited Improper input validation EPSS 100% → fixed in 6.6.0.1 CVE-2018-0296 HIGH exploited Improper input validation EPSS 100% → fixed in 6.2.2.3 CVE-2025-20362 MEDIUM exploited Missing authorization EPSS 84% → fixed in 7.7.10.1 CVE-2020-3259 HIGH exploited ransomware Information disclosure EPSS 72% → fixed in 6.5.0.5 CVE-2024-20353 HIGH exploited CWE-835 EPSS 63% → see advisory CVE-2025-20333 CRITICAL exploited Buffer overflow EPSS 29% → fixed in 7.4.2.4 CVE-2023-20269 MEDIUM exploited ransomware CWE-288 EPSS 22% → see advisory CVE-2024-20359 MEDIUM exploited Code injection EPSS 17% → see advisory CVE-2020-3187 CRITICAL Path traversal EPSS 97% → fixed in 6.5.0.4 CVE-2018-0101 CRITICAL Double free EPSS 87% → see advisorySee all 222 known Cisco Firepower Threat Defense CVEs & security history →
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Frequently asked
Is Cisco Firepower Threat Defense safe and patched?
Cisco Firepower Threat Defense currently scores 0/100 — critical, with active exploitation. 10 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2021-44228. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
What should I do about Cisco Firepower Threat Defense now?
Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against Cisco's official advisory. Some issues are under active exploitation, so treat this as urgent.
lifecycle unknown — needs latest supported version
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against Cisco's official advisory before you patch or upgrade — Cisco Firepower Threat Defense official site ↗