CVE-2026-20065 — Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability

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MEDIUM

Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability

Published Mar 4, 2026

5.8

MEDIUM

CVSS 3.1

EPSS 0.37%

Description

Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in the binder module initialization logic of the Snort Detection Engine. An attacker could exploit this vulnerability by sending certain packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly.

Affected products

Vendor Cisco Product Cisco Secure Firewall Threat Defense (FTD) Software Default
n/a
- Version
  7.0.0
  Status
  affected
  Constraints
  -
- Version
  7.0.0.1
  Status
  affected
  Constraints
  -
- Version
  7.0.1
  Status
  affected
  Constraints
  -
- Version
  7.0.1.1
  Status
  affected
  Constraints
  -
- Version
  7.0.2
  Status
  affected
  Constraints
  -
- Version
  7.0.2.1
  Status
  affected
  Constraints
  -
- Version
  7.0.3
  Status
  affected
  Constraints
  -
- Version
  7.0.4
  Status
  affected
  Constraints
  -
- Version
  7.0.5
  Status
  affected
  Constraints
  -
- Version
  7.0.6
  Status
  affected
  Constraints
  -
- Version
  7.0.6.1
  Status
  affected
  Constraints
  -
- Version
  7.0.6.2
  Status
  affected
  Constraints
  -
- Version
  7.0.6.3
  Status
  affected
  Constraints
  -
- Version
  7.0.7
  Status
  affected
  Constraints
  -
- Version
  7.0.8
  Status
  affected
  Constraints
  -
- Version
  7.0.8.1
  Status
  affected
  Constraints
  -
- Version
  7.1.0
  Status
  affected
  Constraints
  -
- Version
  7.1.0.1
  Status
  affected
  Constraints
  -
- Version
  7.1.0.2
  Status
  affected
  Constraints
  -
- Version
  7.1.0.3
  Status
  affected
  Constraints
  -
- Version
  7.2.0
  Status
  affected
  Constraints
  -
- Version
  7.2.0.1
  Status
  affected
  Constraints
  -
- Version
  7.2.1
  Status
  affected
  Constraints
  -
- Version
  7.2.10
  Status
  affected
  Constraints
  -
- Version
  7.2.10.2
  Status
  affected
  Constraints
  -
- Version
  7.2.2
  Status
  affected
  Constraints
  -
- Version
  7.2.3
  Status
  affected
  Constraints
  -
- Version
  7.2.4
  Status
  affected
  Constraints
  -
- Version
  7.2.4.1
  Status
  affected
  Constraints
  -
- Version
  7.2.5
  Status
  affected
  Constraints
  -
- Version
  7.2.5.1
  Status
  affected
  Constraints
  -
- Version
  7.2.5.2
  Status
  affected
  Constraints
  -
- Version
  7.2.6
  Status
  affected
  Constraints
  -
- Version
  7.2.7
  Status
  affected
  Constraints
  -
- Version
  7.2.8
  Status
  affected
  Constraints
  -
- Version
  7.2.8.1
  Status
  affected
  Constraints
  -
- Version
  7.2.9
  Status
  affected
  Constraints
  -
- Version
  7.3.0
  Status
  affected
  Constraints
  -
- Version
  7.3.1
  Status
  affected
  Constraints
  -
- Version
  7.3.1.1
  Status
  affected
  Constraints
  -
- Version
  7.3.1.2
  Status
  affected
  Constraints
  -
- Version
  7.4.0
  Status
  affected
  Constraints
  -
- Version
  7.4.1
  Status
  affected
  Constraints
  -
- Version
  7.4.1.1
  Status
  affected
  Constraints
  -
- Version
  7.4.2
  Status
  affected
  Constraints
  -
- Version
  7.4.2.1
  Status
  affected
  Constraints
  -
- Version
  7.4.2.2
  Status
  affected
  Constraints
  -
- Version
  7.4.2.3
  Status
  affected
  Constraints
  -
- Version
  7.4.2.4
  Status
  affected
  Constraints
  -
- Version
  7.6.0
  Status
  affected
  Constraints
  -
Vendor Cisco Product Cisco UTD SNORT IPS Engine Software Default
n/a
- Version
  17.10.1a
  Status
  affected
  Constraints
  -
- Version
  17.11.1a
  Status
  affected
  Constraints
  -
- Version
  17.12.1a
  Status
  affected
  Constraints
  -
- Version
  17.12.2
  Status
  affected
  Constraints
  -
- Version
  17.12.3
  Status
  affected
  Constraints
  -
- Version
  17.12.3a
  Status
  affected
  Constraints
  -
- Version
  17.12.4
  Status
  affected
  Constraints
  -
- Version
  17.12.4a
  Status
  affected
  Constraints
  -
- Version
  17.12.4b
  Status
  affected
  Constraints
  -
- Version
  17.12.5
  Status
  affected
  Constraints
  -
- Version
  17.12.5a
  Status
  affected
  Constraints
  -
- Version
  17.12.5b
  Status
  affected
  Constraints
  -
- Version
  17.12.5c
  Status
  affected
  Constraints
  -
- Version
  17.12.5d
  Status
  affected
  Constraints
  -
- Version
  17.12.6
  Status
  affected
  Constraints
  -
- Version
  17.13.1a
  Status
  affected
  Constraints
  -
- Version
  17.14.1a
  Status
  affected
  Constraints
  -
- Version
  17.15.1a
  Status
  affected
  Constraints
  -
- Version
  17.15.2a
  Status
  affected
  Constraints
  -
- Version
  17.15.2c
  Status
  affected
  Constraints
  -
- Version
  17.15.3
  Status
  affected
  Constraints
  -
- Version
  17.15.3a
  Status
  affected
  Constraints
  -
- Version
  17.15.4
  Status
  affected
  Constraints
  -
- Version
  17.15.4c
  Status
  affected
  Constraints
  -
- Version
  17.16.1a
  Status
  affected
  Constraints
  -
- Version
  17.17.1
  Status
  affected
  Constraints
  -
- Version
  17.18.1
  Status
  affected
  Constraints
  -
- Version
  17.18.1a
  Status
  affected
  Constraints
  -
- Version
  17.18.2
  Status
  affected
  Constraints
  -
- Version
  17.2.1r
  Status
  affected
  Constraints
  -
- Version
  17.3.1a
  Status
  affected
  Constraints
  -
- Version
  17.3.2
  Status
  affected
  Constraints
  -
- Version
  17.3.3
  Status
  affected
  Constraints
  -
- Version
  17.3.4
  Status
  affected
  Constraints
  -
- Version
  17.3.4a
  Status
  affected
  Constraints
  -
- Version
  17.3.5
  Status
  affected
  Constraints
  -
- Version
  17.3.6
  Status
  affected
  Constraints
  -
- Version
  17.3.7
  Status
  affected
  Constraints
  -
- Version
  17.3.8
  Status
  affected
  Constraints
  -
- Version
  17.3.8a
  Status
  affected
  Constraints
  -
- Version
  17.4.1a
  Status
  affected
  Constraints
  -
- Version
  17.4.1b
  Status
  affected
  Constraints
  -
- Version
  17.4.2
  Status
  affected
  Constraints
  -
- Version
  17.5.1
  Status
  affected
  Constraints
  -
- Version
  17.5.1a
  Status
  affected
  Constraints
  -
- Version
  17.6.1a
  Status
  affected
  Constraints
  -
- Version
  17.6.2
  Status
  affected
  Constraints
  -
- Version
  17.6.3
  Status
  affected
  Constraints
  -
- Version
  17.6.3a
  Status
  affected
  Constraints
  -
- Version
  17.6.4
  Status
  affected
  Constraints
  -
- Version
  17.6.5
  Status
  affected
  Constraints
  -
- Version
  17.6.6
  Status
  affected
  Constraints
  -
- Version
  17.6.6a
  Status
  affected
  Constraints
  -
- Version
  17.6.7
  Status
  affected
  Constraints
  -
- Version
  17.6.8
  Status
  affected
  Constraints
  -
- Version
  17.6.8a
  Status
  affected
  Constraints
  -
- Version
  17.7.1a
  Status
  affected
  Constraints
  -
- Version
  17.7.2
  Status
  affected
  Constraints
  -
- Version
  17.8.1a
  Status
  affected
  Constraints
  -
- Version
  17.9.1a
  Status
  affected
  Constraints
  -
- Version
  17.9.2a
  Status
  affected
  Constraints
  -
- Version
  17.9.3a
  Status
  affected
  Constraints
  -
- Version
  17.9.4
  Status
  affected
  Constraints
  -
- Version
  17.9.4a
  Status
  affected
  Constraints
  -
- Version
  17.9.5a
  Status
  affected
  Constraints
  -
- Version
  17.9.5e
  Status
  affected
  Constraints
  -
- Version
  17.9.5f
  Status
  affected
  Constraints
  -
- Version
  17.9.6
  Status
  affected
  Constraints
  -
- Version
  17.9.7a
  Status
  affected
  Constraints
  -
- Version
  17.9.7b
  Status
  affected
  Constraints
  -
- Version
  17.9.8
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Cisco

Cisco Secure Firewall Threat Defense (FTD) Software

n/a

Version	Status	Constraints
7.0.0	affected	-
7.0.0.1	affected	-
7.0.1	affected	-
7.0.1.1	affected	-
7.0.2	affected	-
7.0.2.1	affected	-
7.0.3	affected	-
7.0.4	affected	-
7.0.5	affected	-
7.0.6	affected	-
7.0.6.1	affected	-
7.0.6.2	affected	-
7.0.6.3	affected	-
7.0.7	affected	-
7.0.8	affected	-
7.0.8.1	affected	-
7.1.0	affected	-
7.1.0.1	affected	-
7.1.0.2	affected	-
7.1.0.3	affected	-
7.2.0	affected	-
7.2.0.1	affected	-
7.2.1	affected	-
7.2.10	affected	-
7.2.10.2	affected	-
7.2.2	affected	-
7.2.3	affected	-
7.2.4	affected	-
7.2.4.1	affected	-
7.2.5	affected	-
7.2.5.1	affected	-
7.2.5.2	affected	-
7.2.6	affected	-
7.2.7	affected	-
7.2.8	affected	-
7.2.8.1	affected	-
7.2.9	affected	-
7.3.0	affected	-
7.3.1	affected	-
7.3.1.1	affected	-
7.3.1.2	affected	-
7.4.0	affected	-
7.4.1	affected	-
7.4.1.1	affected	-
7.4.2	affected	-
7.4.2.1	affected	-
7.4.2.2	affected	-
7.4.2.3	affected	-
7.4.2.4	affected	-
7.6.0	affected	-

Cisco

Cisco UTD SNORT IPS Engine Software

n/a

Version	Status	Constraints
17.10.1a	affected	-
17.11.1a	affected	-
17.12.1a	affected	-
17.12.2	affected	-
17.12.3	affected	-
17.12.3a	affected	-
17.12.4	affected	-
17.12.4a	affected	-
17.12.4b	affected	-
17.12.5	affected	-
17.12.5a	affected	-
17.12.5b	affected	-
17.12.5c	affected	-
17.12.5d	affected	-
17.12.6	affected	-
17.13.1a	affected	-
17.14.1a	affected	-
17.15.1a	affected	-
17.15.2a	affected	-
17.15.2c	affected	-
17.15.3	affected	-
17.15.3a	affected	-
17.15.4	affected	-
17.15.4c	affected	-
17.16.1a	affected	-
17.17.1	affected	-
17.18.1	affected	-
17.18.1a	affected	-
17.18.2	affected	-
17.2.1r	affected	-
17.3.1a	affected	-
17.3.2	affected	-
17.3.3	affected	-
17.3.4	affected	-
17.3.4a	affected	-
17.3.5	affected	-
17.3.6	affected	-
17.3.7	affected	-
17.3.8	affected	-
17.3.8a	affected	-
17.4.1a	affected	-
17.4.1b	affected	-
17.4.2	affected	-
17.5.1	affected	-
17.5.1a	affected	-
17.6.1a	affected	-
17.6.2	affected	-
17.6.3	affected	-
17.6.3a	affected	-
17.6.4	affected	-
17.6.5	affected	-
17.6.6	affected	-
17.6.6a	affected	-
17.6.7	affected	-
17.6.8	affected	-
17.6.8a	affected	-
17.7.1a	affected	-
17.7.2	affected	-
17.8.1a	affected	-
17.9.1a	affected	-
17.9.2a	affected	-
17.9.3a	affected	-
17.9.4	affected	-
17.9.4a	affected	-
17.9.5a	affected	-
17.9.5e	affected	-
17.9.5f	affected	-
17.9.6	affected	-
17.9.7a	affected	-
17.9.7b	affected	-
17.9.8	affected	-

Remediation

No remediation recorded yet.

Metrics

0.37% 0.00366

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00366

Score over time

Mar–Oct 2026

EPSS v4
EPSS v5

Percentile over time

EPSS v4
EPSS v5

Table of values (3 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.37% (0.00366)	28.02th	v5 (v2026.06.15)
Jun 15, 2026	0.38% (0.00382)	29.75th	v5 (v2026.06.15)
Mar 5, 2026	0.08% (0.00085)	24.53th	v4 (v2025.03.14)

Weaknesses (1)

CWE-667

References (1)

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz
Vendor Advisory

Link	Providers	Tags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz		Vendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Mar 4, 2026

Updated Mar 4, 2026

Reserved Oct 8, 2025

Link CVE-2026-20065

CISA Vulnrichment

Updated Mar 4, 2026

NVD

Status Analyzed

Modified Aug 19, 2026

Link CVE-2026-20065

Red Hat

Severity n/a

Public date n/a

Links CVE-2026-20065