CVE-2026-20027
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
An unauthenticated remote attacker can cause Snort 3 to leak sensitive information or restart by sending crafted DCE/RPC requests.
Vulnerability
Details
CVE-2026-20027 is a vulnerability in the processing of DCE/RPC requests by the Snort 3 Detection Engine, affecting multiple Cisco products. multiple Cisco products. The root cause is an error in buffer handling logic that leads to a buffer out-of-bounds read when processing these requests [1].
Exploitation
An unauthenticated, remote attacker can exploit this vulnerability by sending a large number of specially crafted DCE/RPC requests through an established connection that is inspected by Snort by Snort 3. No authentication is required, and the attack can be carried out over the network [1].
Impact
A successful exploit could allow the attacker to obtain sensitive information from the Snort 3 data stream or cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection [1].
Mitigation
Cisco has released fixed software versions to address this vulnerability. For Snort For Snort 3, the first fixed release is 3.9.6.0. For Cisco Secure Firewall ASA, FMC, and FTD software are also affected, and customers should consult the Cisco Software Checker to determine the appropriate fixed release. Cisco strongly recommends upgrading to a fixed release [1].
AI Insight generated on May 19, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1News mentions
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