CVE-2017-20190 Denial of service in n/a
Attackers can cause temporary client-side performance degradation in Windows by sending multiple Unicode combining characters, known as a Zalgo text attack.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2017-20190?
CVE-2017-20190 is a denial of service vulnerability in n/a, published on 26 Mar 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a "Zalgo text" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.
Weakness: CWE-176
Which versions are affected by CVE-2017-20190?
How do I fix CVE-2017-20190?
No fix has been published for CVE-2017-20190 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-2017-20190 being exploited?
There is no known exploitation of CVE-2017-20190 in the wild and no public exploit code.
Sources
Also known as GHSA-6399-j99h-665c.