CVE-2026-20103 is a denial-of-service vulnerability affecting Cisco Secure Firewall ASA and FTD Software's Remote Access SSL VPN functionality. An unauthenticated, remote attacker can exploit this by sending crafted packets, leading to memory exhaustion and preventing new VPN connections. Rated 8.6 HIGH (CVSSv3.1), the vulnerability is easily exploitable over the network with low complexity, resulting in a high impact on availability. While there is no known active exploitation or public exploit code, the vulnerability has garnered some community attention and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 9.12.1, < 9.16.4.85CPE matchmatch criteria | cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* | ||
>= 9.17.1, < 9.18.4.66CPE matchmatch criteria | cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* | ||
>= 9.19.1, < 9.20.4CPE matchmatch criteria | cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* | ||
>= 9.22.1.1, < 9.22.2.4CPE matchmatch criteria | cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* | ||
>= 9.23.1, < 9.23.1.7CPE matchmatch criteria | cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.