DD-WRT Stack-Based Buffer Overflow Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 21/07/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| DD-WRT | Versions not published yet (product named by CISA KEV) | |
An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handling functionality allows an unauthenticated remote attacker to send a request that would overflow an internal fixed buffer. Exploitation requires the DD-WRT user to enable UPnP (which is off by default, and only listens on internal interfaces by default). This occurs in ssdp_msearch (reachable by an M-SEARCH request).
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free