CVE-2025-20359
Multiple Cisco Products Snort 3 MIME Information Disclosure or Denial of Service Vulnerability
Published Oct 15, 2025
CVSS 3.1 · 6.5 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 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.
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.
Affected Products
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CVE record
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NVD configurations
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Red Hat packages
No data
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Cisco | Cisco Cyber Vision | unknown |
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| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | unknown |
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| Cisco | Cisco UTD SNORT IPS Engine Software | unknown |
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No data.
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cyber Vision | — |
| Cisco | Secure Firewall Threat Defense | — |
| Cisco | Utd Snort Ips Engine Software | — |
Remediation
Tracking
Advisories
Metrics
No CVSS v4.0
Attack Vector Network
Attack Complexity Low
Privileges Required None
Scope Unchanged
Confidentiality Impact Low
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% (0.485% probability within 30 days)
Exploitation none
Automatable yes
Technical Impact partial
References
History
Sep 17, 2026 7:45 PM
First appearance in the feed. Affected versions updated. Affected vendors updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Cisco snort
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| CPEs | cpe:2.3:a:cisco:snort:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Cisco snort
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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 |
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| 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
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Oct 15, 2025 4:30 PM
Description updated. Title 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 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. | |
| Title | Multiple Cisco Products Snort 3 MIME Information Disclosure or Denial of Service Vulnerability | |
| Weaknesses | CWE-127 | |
| References |
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| Metrics |
cvssV3_1
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Subscriptions
Weaknesses
