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CVE-2026-20027— Cisco Snort DCERPC Stub Data Out of Bounds Read

Quick assessment

Affected
Cisco Cisco Secure Firewall Threat Defense (FTD) Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Secure Firewall Threat Defense和Cisco UTD SNORT IPS Engine Software都是美国思科（Cisco）公司的产品。Cisco Secure Firewall Threat Defense是一个集成式防火墙平台。Cisco UTD SNORT IPS Engine Software是一个入侵检测与防御引擎。 Cisco Secure Firewall Threat Defense和Cisco UTD SNORT IPS Engine Sof

CVSS 5.3 · Medium EPSS 0.58% · P45
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I. Basic Information for CVE-2026-20027

Vulnerability Information
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Vulnerability Title
Cisco Snort DCERPC Stub Data Out of Bounds Read
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Firewall Threat Defense和Cisco UTD SNORT IPS Engine Software 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Firewall Threat Defense和Cisco UTD SNORT IPS Engine Software都是美国思科（Cisco）公司的产品。Cisco Secure Firewall Threat Defense是一个集成式防火墙平台。Cisco UTD SNORT IPS Engine Software是一个入侵检测与防御引擎。 Cisco Secure Firewall Threat Defense和Cisco UTD SNORT IPS Engine Sof
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 -
Cisco Cisco UTD SNORT IPS Engine Software 3.17.1S -

II. Public POCs for CVE-2026-20027

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III. Intelligence Information for CVE-2026-20027

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Vendor Advisories for CVE-2026-20027 (1)

Same Patch Batch · Cisco · 2026-01-07 · 3 CVEs total

CVE-2026-20026 5.8 MEDIUM Multiple Cisco Products Snort 3 DCERPC Vulnerabilities
CVE-2026-20029 4.9 MEDIUM Cisco Identity Services Engine XML External Entity Processing Information Disclosure Vulne

IV. Related Vulnerabilities

Same product: Cisco Secure Firewall Threat Defense (FTD) Software
Same vendor: Cisco
Same weakness: CWE-200

V. Comments for CVE-2026-20027

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