Critical severity · published Oct 15, 2025
CVE-2025-20359
Multiple Cisco Products Snort 3 MIME Information Disclosure or Denial of Service Vulnerability
9.1
CVSS
0.5%
EPSS
No
On KEV
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 disclosure of possible sensitive data or cause the Snort 3 Detection Engine to crash.
This vulnerability is due to an error in the logic of buffer handling when the MIME fields of the HTTP header are parsed. This can result in a buffer under-read. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to induce one of two possible outcomes: the unexpected restarting of the Snort 3 Detection Engine, which could cause a denial of service (DoS) condition, or information disclosure of sensitive information in the Snort 3 data stream. Due to the under-read condition, it is possible that sensitive information that is not valid connection data could be returned.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Cisco Cyber Vision · Cisco
3.0.0; 3.0.2; 3.0.3; 3.0.1; 3.1.0; 3.0.4; +34 more · source: vendor
CS
Cisco Secure Firewall Threat Defense (FTD) Software · Cisco
7.4.1; 7.4.1.1; 7.6.0; 7.4.2; 7.4.2.1; 7.7.0; +4 more · source: vendor
CU
Cisco UTD SNORT IPS Engine Software · Cisco
3.17.1S; 16.12.3; 16.12.4; 17.3.1a; 16.6.6; 16.12.2; +34 more · source: vendor
SN
Snort · Cisco
3.0.0-233 before 3.9.3.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-20359
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-20359
Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-tTL8PgVH
More from Cisco Cyber Vision
9.0
CVE-2026-20043
Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
7.8
CVE-2026-20291
Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
7.5
CVE-2026-20356
Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
7.5
CVE-2026-20236
Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
7.5
CVE-2022-20685
Multiple Cisco Products Snort Modbus Denial of Service Vulnerability
