CVE-2026-20050
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
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2Tags
Description
A vulnerability in the Do Not Decrypt exclusion feature of the SSL decryption feature of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management during the inspection of TLS 1.2 encrypted traffic. An attacker could exploit this vulnerability by sending crafted TLS 1.2 encrypted traffic through an affected device. A successful exploit could allow the attacker to cause a reload of an affected device. Note: This vulnerability only affects traffic that is encrypted by TLS 1.2. Other versions of TLS are not affected.
Analysis
Device reloads in Cisco Secure Firewall Threat Defense can be triggered by unauthenticated remote attackers sending specially crafted TLS 1.2 traffic through the SSL decryption feature, exploiting improper memory management in the Do Not Decrypt exclusion logic. The vulnerability requires specific network conditions and TLS 1.2 traffic to trigger, resulting in denial of service with no authentication required. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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