CVE-2025-20219Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Access Control Bypass Vulnerability
- 5.3MediumCVSS base score
- 0.43%Exploitation in 30 daysEPSS · top 63% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the implementation of access control rules for loopback interfaces in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should have been blocked to a loopback interface. This vulnerability is due to improper enforcement of access control rules for loopback interfaces. An attacker could exploit this vulnerability by sending traffic to a loopback interface on an affected device. A successful exploit could allow the attacker to bypass configured access control rules and send traffic that should have been blocked to a loopback interface on the device.
Timeline
ID reserved
By cisco
- 10 months later
· 10 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVDNVD · Deferred | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.43% · top 63% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
Cisco · Cisco Adaptive Security Appliance (ASA) Software
- affected 9.18.2
- affected 9.18.2.5
- affected 9.18.2.7
- affected 9.19.1
- affected 9.18.2.8
- affected 9.18.3
- affected 9.19.1.5
- affected 9.19.1.9
- affected 9.18.3.39
- affected 9.19.1.12
- affected 9.18.3.46
- affected 9.19.1.18
- affected 9.18.3.53
- affected 9.18.3.55
- affected 9.18.3.56
- affected 9.20.1
- affected 9.19.1.22
- affected 9.18.4
- affected 9.20.1.5
- affected 9.18.4.5
- affected 9.19.1.24
- affected 9.18.4.8
- affected 9.20.2
- affected 9.19.1.27
- affected 9.18.4.22
- affected 9.20.2.10
- affected 9.19.1.28
- affected 9.18.4.24
- affected 9.20.2.21
- affected 9.19.1.31
- affected 9.18.4.29
- affected 9.20.2.22
- affected 9.18.4.34
- affected 9.20.3
- affected 9.18.4.40
- affected 9.22.1.1
- affected 9.20.3.4
- affected 9.18.4.47
- affected 9.20.3.7
- affected 9.19.1.37
- and 4 more
Cisco · Cisco Firepower Threat Defense Software
- affected 7.3.0
- affected 7.3.1
- affected 7.3.1.1
- affected 7.4.0
- affected 7.4.1
- affected 7.4.1.1
- affected 7.3.1.2
- affected 7.6.0
- affected 7.4.2
- affected 7.4.2.1
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-24848 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-20219)Record last updated .