CVE-2026-20291

highpriority · track · 31EPSS 0.001 · 2 %ileFRNLUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.12% (2nd) EPSS
CVSS 7.8 · high
Is it mine?
278 products
Check your exposure
Who says so?
3 sources
cisco_csaf · ncsc_nl · certfr

EPSS · scored 2026-10-24

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20291 are related to issues concerning improper privilege management that are grouped under the Common Weakness Enumeration (CWE) Base CWE-269.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

7.8
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · psirt@cisco.com USexploitability 1.8 · impact 5.9
v3.17.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL
v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269USCWE-269USCWE-787US
05

affected products (278)

Products and version ranges known to be affected.

showing 20 of 278
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0450Kwetsbaarheden verholpen in Snort 3 van CiscoNL2026-10-22csaf · ncsc_nlNL

    Cisco heeft meerdere kwetsbaarheden verholpen in Snort 3, het open source intrusion detection en prevention systeem dat in diverse Cisco-producten wordt gebruikt.

  • cisco-sa-hardening-snort3-ybgmhTQeMultiple Cisco Products Snort 3 Security Hardening Release: October 20262026-10-21csaf · cisco_csafUS

    As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco-owned Open Source Snort 3 engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. These vulnerabilities were found during internal testing and are not known to be actively exploited. To assist customers in patching and to streamline the disclosure process, Cisco has grouped these issues by their underlying vulnerability class - Common Weakness Enumeration (CWE) - and assigned a single Common Vulnerabilities and Exposures Identifier (CVE ID) to each CWE grouping. Note: Cisco may publish separate security advisories that provide additional details about individual vulnerabilities that are addressed in this release. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of October 21, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-QGwHnJ6k"].

  • CERTFR-2026-AVI-1360Multiples vulnérabilités dans les produits CiscoFrançais2026-10-22vendor · certfrFR
07

sources

Which sources assert this record, and when.

cisco_csafncsc_nlcertfrNVDCVE.orgMITRE
published 2026-10-21modified 2026-10-22
08

references (1) nvd

External citations — patches, advisories, analysis.

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