Secure Firewall Threat Defense
CVE-2026-20052
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Primary rating from Vendor (cisco) · only source for this CVE.
CVSS VectorVendor: cisco
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.
This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.
AnalysisAI
Denial of service in Cisco Secure Firewall Threat Defense via crafted SSL packets allows unauthenticated remote attackers to crash the Snort 3 Detection Engine through a memory management logic error during SSL inspection. An attacker can exploit this vulnerability by sending malicious SSL packets through an established connection, forcing the detection engine to unexpectedly restart and interrupt security monitoring. No patch is currently available for this medium-severity issue.
Technical ContextAI
in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.
This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection E
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Cisco Snort 3 Detection Engine can be remotely restarted by an unauthenticated attacker through crafted HTTP packets exp
Unauthenticated remote attackers can crash the Snort 3 Detection Engine by sending crafted HTTP packets with malformed M
Denial of service in Cisco Snort 3's VBA decompression feature allows unauthenticated remote attackers to crash the dete
Improper error checking in Cisco Snort 3's VBA decompression feature allows unauthenticated remote attackers to trigger
Improper range checking in Cisco Snort 3's VBA decompression feature allows unauthenticated remote attackers to trigger
Cisco Secure Firewall Threat Defense (FTD) Software is vulnerable to denial of service through improper TLS protocol imp
Snort 3 Detection Engine in multiple Cisco products can be remotely restarted by unauthenticated attackers through craft
Snort 3 detection engine contains a vulnerability that allows attackers to cause a DoS condition when the Snort 3 Detect
Snort 3 Detection Engine contains a vulnerability that allows attackers to cause a denial of service (DoS) condition whe
Snort rule bypass in Cisco Secure Firewall Threat Defense allows unauthenticated remote attackers to evade deep packet i
Same technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today