CVE-2025-20360

Multiple Cisco Products Snort 3 MIME Denial of Service Vulnerability

Published Oct 15, 2025 CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed

Description

Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.

This vulnerability is due to a lack of complete error checking when the MIME fields of the HTTP header are parsed. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.

Affected Products

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 Cyber Vision

unknown

Version	Status	Constraints
`3.0.0`	affected	—
`3.0.2`	affected	—
`3.0.3`	affected	—
`3.0.1`	affected	—
`3.1.0`	affected	—
`3.0.4`	affected	—
`3.1.1`	affected	—
`3.1.2`	affected	—
`3.2.0`	affected	—
`3.0.5`	affected	—
`3.2.1`	affected	—
`3.0.6`	affected	—
`3.2.2`	affected	—
`3.2.3`	affected	—
`3.2.4`	affected	—
`4.0.0`	affected	—
`4.0.1`	affected	—
`4.0.2`	affected	—
`4.0.3`	affected	—
`4.1.0`	affected	—
`4.1.1`	affected	—
`4.1.2`	affected	—
`4.1.3`	affected	—
`4.1.4`	affected	—
`4.2.0`	affected	—
`4.2.1`	affected	—
`4.1.5`	affected	—
`4.2.2`	affected	—
`4.2.X`	affected	—
`4.2.3`	affected	—
`4.2.4`	affected	—
`4.2.6`	affected	—
`4.1.6`	affected	—
`4.3.0`	affected	—
`4.3.1`	affected	—
`4.3.2`	affected	—
`4.3.3`	affected	—
`4.4.0`	affected	—
`4.4.1`	affected	—
`4.4.2`	affected	—
`4.4.3`	affected	—
`4.1.7`	affected	—
`5.0.0`	affected	—
`5.0.1`	affected	—
`5.0.2`	affected	—
`5.1.0`	affected	—
`5.1.1`	affected	—
`5.1.2`	affected	—
`5.1.3`	affected	—
`5.2.0`	affected	—
`5.2.1`	affected	—

Cisco

Cisco Secure Firewall Threat Defense (FTD) Software

unknown

Version	Status	Constraints
`7.3.0`	affected	—
`7.3.1`	affected	—
`7.3.1.1`	affected	—
`7.4.0`	affected	—
`7.4.1`	affected	—
`7.4.1.1`	affected	—
`7.3.1.2`	affected	—
`7.6.0`	affected	—
`7.4.2`	affected	—
`7.4.2.1`	affected	—
`7.7.0`	affected	—
`7.4.2.2`	affected	—
`7.6.1`	affected	—
`7.4.2.3`	affected	—
`7.4.2.4`	affected	—

No data.

Vendor	Product	Versions
Cisco	Cyber Vision	—
Cisco	Secure Firewall Threat Defense	—
Cisco	Utd Snort Ips Engine Software	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.382% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-tTL8PgVH

History

Feb 12, 2026 7:00 PM Description updated. Title updated View changes

Type	Values Removed	Values Added
Description	Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This vulnerability is due to a lack of complete error checking when the MIME fields of the HTTP header are parsed. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.	Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This vulnerability is due to a lack of complete error checking when the MIME fields of the HTTP header are parsed. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.
Title		Multiple Cisco Products Snort 3 MIME Denial of Service Vulnerability

Oct 21, 2025 9:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco cyber Vision Cisco secure Firewall Threat Defense Cisco utd Snort Ips Engine Software
Vendors & Products		Cisco Cisco cyber Vision Cisco secure Firewall Threat Defense Cisco utd Snort Ips Engine Software

Oct 15, 2025 6:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 15, 2025 4:30 PM Description updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This vulnerability is due to a lack of complete error checking when the MIME fields of the HTTP header are parsed. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.
Weaknesses		CWE-805
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-tTL8PgVH
Metrics		cvssV3_1 `{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L'}`