Technology · Cisco
Cisco Firepower Threat Defense vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 33 vulnerabilities in Cisco Firepower Threat Defense: 0 in the last 7 days and 16 in the last 90 days, 4 of them critical and 3 exploited in the wild. The most recent, CVE-2026-76489, was published on 21 October 2026. 11 vulnerabilities in the last four weeks, up 120% on the four before (5). 1 critical against 0.
- Last 7 days
- 0
- Last 90 days
- 16
- Critical, all time
- 4
- Exploited in the wild
- 3
About Cisco Firepower Threat Defense
Cisco security platform that provides threat defense, intrusion prevention, and firewall capabilities.
Latest Cisco Firepower Threat Defense vulnerabilities
- CVE-2026-76489: Cisco Snort 3 memory management denial of servicemediumCVSS 5.8
- CVE-2026-76445: Cisco Snort 3 Detection Engine denial of service in GTP codecmediumCVSS 5.3
- CVE-2026-20356: Cisco Snort 3 uncontrolled resource consumptionhighCVSS 7.5
- CVE-2026-20291: Cisco Snort 3 improper privilege managementhighCVSS 7.8
- CVE-2026-20236: Cisco Snort 3 incorrect calculation vulnerabilityhighCVSS 7.5
- CVE-2026-20221: Cisco multiple products Snort 3 GRE tunnel denial of servicemediumCVSS 5.8
- CVE-2026-20218: Cisco Snort 3 VBA decompression buffer overflow denial of servicemediumCVSS 5.8
- CVE-2026-20197: Cisco Snort 3 Teredo detection engine denial of servicemediumCVSS 5.8
- CVE-2026-20043: Cisco Snort 3 out-of-bounds writecriticalCVSS 9
- CVE-2026-20019: Cisco Snort 3 NetFlow Detection Engine denial of servicemediumCVSS 5.8
- CVE-2026-20011: Cisco multiple products SMTP MIME parsing denial of service in Snort 3mediumCVSS 5.8
- CVE-2026-20336: Cisco Secure Firewall software resource lifecycle vulnerabilityhighCVSS 8.8EPSS 0.2%
- CVE-2026-20323: Cisco Secure FMC and FTD sftunnel authentication bypasshighCVSS 8.3EPSS 0.1%
- CVE-2026-20295: Cisco Secure FMC and FTD memory exhaustion in sftunnelhighCVSS 8.6EPSS 0.5%
- CVE-2026-20290: Cisco Secure Firewall Threat Defense SSL/TLS denial of service in Snort 2mediumCVSS 5.8EPSS 0.2%
- CVE-2026-20120: Cisco Secure Firewall ASA/FTD access control bypass in OGSmediumCVSS 5.8EPSS 0.4%
- CVE-2026-20064: Cisco Secure Firewall Threat Defense authenticated DoS via CLI input validationmediumCVSS 6.5EPSS 0.1%
- CVE-2026-20016: Cisco Secure Firewall ASA and FTD command injection in FXOS CLImediumCVSS 6EPSS 0.0%
- CVE-2026-20068: Cisco Snort 3 detection engine denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20066: Cisco Snort 3 Detection Engine denial of service in HTTP JavaScript normalizationmediumCVSS 5.8EPSS 0.4%
- CVE-2026-20065: Cisco Snort 3 Detection Engine denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20057: Cisco Snort 3 VBA decompression denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20053: Cisco Snort 3 VBA decompression denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20052: Cisco Secure Firewall Threat Defense Snort 3 memory management denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20050: Cisco Secure Firewall Threat Defense SSL decryption denial of servicemediumCVSS 6.8EPSS 0.4%
Most severe Cisco Firepower Threat Defense vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2025-20333: Cisco ASA and FTD buffer overflow in VPN web servercriticalexploited in the wildCVSS 9.9EPSS 70.7%
- CVE-2023-20269: Cisco Adaptive Security Appliance and Firepower Threat Defense Unauthorized Access Vulnerabilitycriticalexploited in the wildCVSS 9.1
- CVE-2025-20362: Cisco Secure Firewall ASA and FTD missing authorization in VPN web servercriticalexploited in the wildCVSS 6.5EPSS 87.1%
- CVE-2026-20043: Cisco Snort 3 out-of-bounds writecriticalCVSS 9
- CVE-2026-20336: Cisco Secure Firewall software resource lifecycle vulnerabilityhighCVSS 8.8EPSS 0.2%
- CVE-2026-20295: Cisco Secure FMC and FTD memory exhaustion in sftunnelhighCVSS 8.6EPSS 0.5%
- CVE-2026-20323: Cisco Secure FMC and FTD sftunnel authentication bypasshighCVSS 8.3EPSS 0.1%
- CVE-2026-20291: Cisco Snort 3 improper privilege managementhighCVSS 7.8
- CVE-2026-20356: Cisco Snort 3 uncontrolled resource consumptionhighCVSS 7.5
- CVE-2026-20236: Cisco Snort 3 incorrect calculation vulnerabilityhighCVSS 7.5
Vulnerabilities per week
11 vulnerabilities in the last four weeks, up 120% on the four before (5). 1 critical against 0. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 5 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 11 | 1 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Cisco Firepower Threat Defense vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/firepower-threat-defense)<a href="https://junglewise.ai/threats/technologies/firepower-threat-defense"><img src="https://junglewise.ai/threats/technologies/firepower-threat-defense/badge.svg" alt="Cisco Firepower Threat Defense vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/firepower-threat-defense.json, and this page as text at https://junglewise.ai/threats/technologies/firepower-threat-defense.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Cisco Firepower Threat Defense vulnerabilities", https://junglewise.ai/threats/technologies/firepower-threat-defense, 11 November 2026.