Teeworlds · Teeworlds · CVE-2021-43518
**Name of the Vulnerable Software and Affected Versions**
Teeworlds versions up to and including 0.7.5
**Description**
The issue arises from a map parser that does not validate the `m Channels` value coming from a map file, leading to a buffer overflow. A malicious server can offer a specially crafted map that will overwrite the client's stack, causing denial of service or code execution.
**Recommendations**
For Teeworlds versions up to and including 0.7.5, as a temporary workaround, consider disabling the map parser function until a patch is available. Restrict access to malicious servers to minimize the risk of exploitation. Avoid using maps from untrusted sources until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.