CVE-2021-47827 WebSSH for iOS 14.16.10 - 'mashREPL' Denial of Service
Attackers can crash the WebSSH iOS application by pasting malformed input into the mashREPL tool, 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-2021-47827?
CVE-2021-47827 is a medium-severity denial of service vulnerability in WebSSH for iOS, published on 16 Jan 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
WebSSH for iOS 14.16.10 contains a denial of service vulnerability in the mashREPL tool that allows attackers to crash the application by pasting malformed input. Attackers can trigger the vulnerability by copying a 300-character buffer of repeated 'A' characters into the mashREPL input field, causing the application to crash.
Weakness: CWE-1284
Which versions are affected by CVE-2021-47827?
How do I fix CVE-2021-47827?
No fix has been published for CVE-2021-47827 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-2021-47827 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47827 exists.
Sources
Also known as GHSA-cfgg-734h-mqgc.