CVE-2018-0227
No exploitation reported by the sources we read.
- Published2018-04-19
- WeaknessCWE-295
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A vulnerability in the Secure Sockets Layer (SSL) Virtual Private Network (VPN) Client Certificate Authentication feature for Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to establish an SSL VPN connection and bypass certain SSL certificate verification steps. The vulnerability is due to incorrect verification of the SSL Client Certificate. An attacker could exploit this vulnerability by connecting to the ASA VPN without a proper private key and certificate pair. A successful exploit could allow the attacker to establish an SSL VPN connection to the ASA when the connection should have been rejected. This vulnerability affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software that is running on the following Cisco products: 3000 Series Industrial Security Appliances (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliances (ASAv), Firepower 4110 Security Appliances, Firepower 9300 ASA Security Modules. Cisco Bug IDs: CSCvg40155.
Timeline
dates in UTC- 2018-04-1920:29CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-0227?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-0227?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.4 | ≥ 9.4.4, ≤ 9.4.4.13 | no fix published | NVD |
| 9.5 | ≥ 9.5.3.7, ≤ 9.5.3.9 | no fix published | NVD |
| 9.6 | ≥ 9.6.2.9, ≤ 9.6.2.21 | no fix published | NVD |
| 9.6 | ≥ 9.6.3, ≤ 9.6.3.17 | no fix published | NVD |
| 9.4 | = 9.4.3.1 | no fix published | NVD |
| 9.4 | = 9.4.3.2 | no fix published | NVD |
| 9.5 | = 9.5.2.7 | no fix published | NVD |
| 9.5 | = 9.5.2.8 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 6.0 | ≥ 6.0, ≤ 6.0.1.4 | no fix published | NVD |
| 6.1 | ≥ 6.1.0, ≤ 6.1.0.5 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- tools.cisco.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Published
- 2018-04-19
- Last Modified
- 2026-08-11
- NVD status
- Modified
Frequently asked questions
What is CVE-2018-0227?
Is CVE-2018-0227 actively exploited?
What is the CVSS score for CVE-2018-0227?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.