CVE-2025-20127 describes a denial-of-service vulnerability in the TLS 1.3 implementation of Cisco Secure Firewall ASA Software and FTD Software on Firepower 3100 and 4200 Series devices. An authenticated, remote attacker can exploit a flaw in the TLS_CHACHA20_POLY1305_SHA256 cipher to consume resources, preventing new SSL/TLS or VPN connections until the device is reloaded. This vulnerability carries a CVSS score of 7.7 (High), indicating a high impact on availability with low attack complexity and no user interaction required. While there is no known public exploit code or active exploitation, the vulnerability has garnered community discussion and media coverage, suggesting awareness within the cybersecurity landscape.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
7.4.0CPE matchmatch criteria | cpe:2.3:a:cisco:firepower_threat_defense:7.4.0:*:*:*:*:*:*:* | ||
7.4.1CPE matchmatch criteria | cpe:2.3:a:cisco:firepower_threat_defense:7.4.1:*:*:*:*:*:*:* | ||
7.4.1.1CPE matchmatch criteria | cpe:2.3:a:cisco:firepower_threat_defense:7.4.1.1:*:*:*:*:*:*:* | ||
7.4.2CPE matchmatch criteria | cpe:2.3:a:cisco:firepower_threat_defense:7.4.2:*:*:*:*:*:*:* | ||
7.4.2.1CPE matchmatch criteria | cpe:2.3:a:cisco:firepower_threat_defense:7.4.2.1:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.