Firepower Threat Defense vulnerabilitiesAnd the versions its exploited flaws hit.
Firepower Threat Defense is made by Cisco. We track 220 published vulnerabilities listed under that exact name, across 380 versions. 11 of them are on the list of flaws known to be exploited, the newest added on 25 September 2025. Cisco lists newer releases under their own names, such as Firepower Threat Defense Software, so check those pages too.
The most recent Firepower Threat Defense flaw added to the known-exploited list is CVE-2025-20362, on 25 September 2025. We keep watching the known-exploited list.
Is Firepower Threat Defense listed under other names? Yes.
Cisco also lists Firepower Threat Defense under more specific names, such as Firepower Threat Defense Software and Firepower Threat Defense for ISR. Flaws listed only under those names are counted on their own pages, not here. If you run one of these, open its page for its own exploited flaws.
Which versions of Firepower Threat Defense do the exploited flaws hit?
Each exploited flaw lists the versions it affects, usually as ranges. "7.0.0 to before 7.0.8.1" means from 7.0.0 up to, but not including, 7.0.8.1. Find your version, then patch.
- CVE-2025-20362Exploited list, 25 Sep 2025
Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability
7.0.0 to before 7.0.8.17.1.0 to before 7.2.10.27.3.0 to before 7.4.2.47.6.0 to before 7.6.2.17.7.0 to before 7.7.10.1 - CVE-2025-20333Exploited list, 25 Sep 2025
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
7.0.0 to before 7.0.8.17.1.0 to before 7.2.97.3.0 to before 7.4.2.47.6.0 - CVE-2020-3259Exploited list, 15 Feb 2024
Cisco ASA and FTD Information Disclosure Vulnerability
6.2.3 to before 6.2.3.166.3.0 to before 6.3.0.66.4.0 to before 6.4.0.96.5.0 to before 6.5.0.5 - CVE-2023-44487Exploited list, 10 Oct 2023
HTTP/2 Rapid Reset Attack Vulnerability
before 7.4.2 - CVE-2023-20269Exploited list, 13 Sep 2023
Cisco Adaptive Security Appliance and Firepower Threat Defense Unauthorized Access Vulnerability
6.2.36.2.3.16.2.3.26.2.3.36.2.3.46.2.3.56.2.3.66.2.3.7 - CVE-2021-44228Exploited list, 10 Dec 2021
Apache Log4j2 Remote Code Execution Vulnerability
6.2.36.3.06.4.06.5.06.6.06.7.07.0.07.1.0 - CVE-2018-0296Exploited list, 3 Nov 2021
Cisco Adaptive Security Appliance (ASA) Denial-of-Service Vulnerability
6.0 to before 6.1.06.2.1 to before 6.2.2.36.2.36.2.3.16.2.3-85.026.2.3-851 - CVE-2020-3580Exploited list, 3 Nov 2021
Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability
before 6.4.0.126.5.0 to before 6.6.46.7.0 to before 6.7.0.2 - CVE-2020-3452Exploited list, 3 Nov 2021
Cisco ASA and FTD Read-Only Path Traversal Vulnerability
6.2.3 to before 6.2.3.166.3.0 to before 6.3.0.66.4.0 to before 6.4.0.106.5.0 to before 6.5.0.56.6.0 to before 6.6.0.1
2 more exploited flaws name Firepower Threat Defense without a version of its own, for example as the system other affected software runs on. They are in the list below.
Which Firepower Threat Defense vulnerabilities are being exploited?
11 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 6.5Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability
Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a missing authorization vulnerability.
- 9.9Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
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.
- 6.0Cisco ASA and FTD Privilege Escalation Vulnerability
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain a privilege escalation vulnerability that can allow local privilege escalation from Administrator to root.
- 8.6Cisco ASA and FTD Denial of Service Vulnerability
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.
- 7.5Cisco ASA and FTD Information Disclosure Vulnerability
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an information disclosure vulnerability.
- 7.5HTTP/2 Rapid Reset Attack Vulnerability
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
- 5.0Cisco Adaptive Security Appliance and Firepower Threat Defense Unauthorized Access Vulnerability
Cisco Adaptive Security Appliance and Firepower Threat Defense contain an unauthorized access vulnerability that could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to...
- 10.0Apache Log4j2 Remote Code Execution Vulnerability
Apache Log4j2 contains a vulnerability where JNDI features do not protect against attacker-controlled JNDI-related endpoints, allowing for remote code execution.
Which Firepower Threat Defense flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- >99%
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
- >99%
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct directory...
- >99%
A vulnerability in the web interface of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service...
- 97%CVE-2020-3187Critical
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct directory...
- 87%
Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA Software or Cisco Secure FTD Software releases that are affected by CVE-2025-20333 and CVE-2025-20362.
- 87%CVE-2018-0101Critical
A vulnerability in the Secure Sockets Layer (SSL) VPN functionality of the Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause a reload of the affected system or...
- 86%
Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct...
- 72%
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory...
- 71%
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 authenticated, remote attacker to...
Running Firepower Threat Defense? We'll keep checking.
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1 flaw being exploited affects software Acme tracks
Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a missing authorization vulnerability. This vulnerability could be chained with CVE-2025-20333.
- Matched to
- Firepower Threat Defense on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 220 published vulnerabilities listed under the name Firepower Threat Defense, across 380 versions. The most recent Firepower Threat Defense flaw added to the known-exploited list is CVE-2025-20362, on 25 September 2025.
11 are on the list of flaws known to be exploited. The most recently added are CVE-2025-20362, CVE-2025-20333 and CVE-2024-20359.
Cisco also lists Firepower Threat Defense under more specific names, such as Firepower Threat Defense Software and Firepower Threat Defense for ISR. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.
Each flaw names its own versions, usually as ranges. The newest, CVE-2025-20362, affects 7.0.0 to before 7.0.8.1, 7.1.0 to before 7.2.10.2, 7.3.0 to before 7.4.2.4, 7.6.0 to before 7.6.2.1 and more. The versions for every exploited flaw are listed on this page.
Create a Precursor Intelligence account and track Firepower Threat Defense. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.