CVE-2026-20027: medium-severity vulnerability in Cisco Secure Firewall Threat Defense (FTD)…
Cisco Snort DCERPC Stub Data Out of Bounds Read
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.6%
Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection.
This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer out-of-bounds read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to obtain sensitive information in the Snort 3 data stream.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Cisco · Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco · Cisco UTD SNORT IPS Engine SoftwareRelated CVEs — Cisco Secure Firewall Threat Defense (FTD)…
In the same product, most dangerous first.
CVE-2025-20362MEDIUMCVE-2025-20362EPSS 86.7%KEVCVE-2025-20333CRITICALCVE-2025-20333EPSS 72.0%KEVCVE-2026-20349HIGHCisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service VulnerabilityEPSS 1.0%KEVCVE-2026-76418HIGHCisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service VulnerabilityEPSS 0.8%KEVCVE-2021-1285HIGHMultiple Cisco Products SNORT Ethernet Frame Decoder Denial of Service VulnerabilityEPSS 2.9%CVE-2022-20685HIGHMultiple Cisco Products Snort Modbus Denial of Service VulnerabilityEPSS 1.5%