CVE-2026-20027 Cisco Snort DCERPC Stub Data Out of Bounds Read
Unauthenticated remote attackers can trigger an out-of-bounds read in Snort 3 to leak sensitive data or cause service interruption via DCE/RPC requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20027?
CVE-2026-20027 is a medium-severity vulnerability in Cisco Secure Firewall Threat Defense (FTD) Software, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-200
Which versions are affected by CVE-2026-20027?
How do I fix CVE-2026-20027?
No fix has been published for CVE-2026-20027 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20027 being exploited?
There is no known exploitation of CVE-2026-20027 in the wild and no public exploit code.
Sources
Also known as GHSA-8852-3pqj-jhpv.