CVE-2025-20127

CWE-4044 documents4 sources
Severity
7.7HIGH
EPSS
0.2%
top 59.16%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Cisco Cisco Adaptive Security Appliance (asa) SoftwareCisco Cisco Firepower Threat Defense SoftwareCisco Adaptive Security Appliance Software+1 more
Timeline
PublishedAug 14

Description

A vulnerability in the TLS 1.3 implementation for a specific cipher for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Firepower 3100 and 4200 Series devices could allow an authenticated, remote attacker to consume resources that are associated with incoming TLS 1.3 connections, which eventually could cause the device to stop accepting any new SSL/TLS or VPN requests. This vulnerability is due to the implementat…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HExploitability: 3.1 | Impact: 4.0

Affected Packages4 packages

🔴Vulnerability Details

2
GHSA
GHSA-pgh5-2r5j-h8rf: A vulnerability in the TLS 1↗2025-08-14
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CVEList
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software for Firepower 3100 and 4200 Series TLS Cipher Denial of Service Vulnerability↗2025-08-14
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📋Vendor Advisories

1
Cisco
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Firepower 3100 and 4200 Series TLS 1.3 Cipher Denial of Service Vulnerability↗2025-08-14
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CVE-2025-20127 (HIGH CVSS 7.7) | A vulnerability in the TLS 1.3 impl | cvebase.io