PT-2026-2047 · Snort+1 · Snort 3 Detection Engine+1

Guy Lederfein · Published 2026-01-07 · Updated 2026-01-28 · CVE-2026-20027

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Cisco products (affected versions not specified)

Description A flaw exists in the processing of DCE/RPC requests that may allow a remote attacker to obtain sensitive information or cause the Snort 3 Detection Engine to restart, leading to an interruption of packet inspection. This is due to an error in buffer handling logic when processing DCE/RPC requests, resulting in a buffer out-of-bounds read. An attacker could exploit this by sending numerous DCE/RPC requests through an established connection inspected by Snort 3. The vulnerability could allow an attacker to obtain sensitive information from the Snort 3 data stream.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

BDU:2026-01756

CVE-2026-20027

ZDI-26-045

Affected Products

Cisco Products

Snort 3 Detection Engine

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-20027 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-26-045 · Security Note
• https://bdu.fstec.ru/vul/2026-01756 · Security Note
• https://twitter.com/autumn_good_35/status/2009299169265991945 · Twitter Post
• https://twitter.com/CVEnew/status/2008945922290409556 · Twitter Post
• https://reddit.com/r/KibernetinisSaugumas/comments/1q7awdv/cisco_snort_3_pa%C5%BEeid%C5%BEiamumas_atskleid%C5%BEia · Reddit Post
• https://twitter.com/ThreatSynop/status/2009279248788295929 · Twitter Post
• https://twitter.com/ThreatSynop/status/2009249081550406095 · Twitter Post