CVE-2019-25570 RealTerm Serial Terminal 2.0.0.70 Denial of Service via Port Field
Local attackers can crash RealTerm Serial Terminal by pasting an excessively long string into the Port field, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2019-25570?
CVE-2019-25570 is a medium-severity denial of service vulnerability in RealTerm: Serial Terminal, published on 21 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
RealTerm Serial Terminal 2.0.0.70 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long string in the Port field. Attackers can paste a buffer of 1000 characters into the Port input field and click the open button to trigger a crash.
Weakness: CWE-1260
Which versions are affected by CVE-2019-25570?
It affects 1 product.
Products include Crun Realterm.
How do I fix CVE-2019-25570?
No fix has been published for CVE-2019-25570 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-2019-25570 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25570 exists.
Other vulnerabilities in RealTerm: Serial Terminal
Sources
Also known as GHSA-8m9x-gfww-f5vw.