CVE-2025-20360 Multiple Cisco Products Snort 3 MIME Denial of Service Vulnerability
An unauthenticated remote attacker can cause a denial of service by sending crafted HTTP packets that trigger a restart of the Snort 3 Detection Engine.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-20360?
CVE-2025-20360 is a medium-severity denial of service vulnerability in Cisco Cyber Vision, published on 15 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-805
Which versions are affected by CVE-2025-20360?
How do I fix CVE-2025-20360?
No fix has been published for CVE-2025-20360 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-20360 being exploited?
There is no known exploitation of CVE-2025-20360 in the wild and no public exploit code.
Sources
Also known as GHSA-6w3w-cx38-4j8c.