CVE-2025-56233 Denial of service in n/a
Attackers can disrupt TCP connections by sending random RST or SYN packets within the acceptable sequence number range, causing denial of service.
- 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-2025-56233?
CVE-2025-56233 is a high-severity denial of service vulnerability in n/a, published on 29 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Openindiana, kernel SunOS 5.11 has a denial of service vulnerability. For the processing of TCP packets with RST or SYN flag set, Openindiana has a wide acceptable range of sequence numbers. It does not require the sequence number to exactly match the next expected sequence value, just to be within the current receive window, which violates RFC5961. This flaw allows attackers to send multiple random TCP RST/SYN packets to hit the acceptable range of sequence numbers, thereby interrupting normal connections and causing a denial of service attack.
Weakness: CWE-400
Which versions are affected by CVE-2025-56233?
How do I fix CVE-2025-56233?
No fix has been published for CVE-2025-56233 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-2025-56233 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-56233 exists.
Sources
Also known as GHSA-325f-j5c3-chxm.