In CISA KEV8.1 HighCWE-121
CVE-2021-27137
DD-WRT Stack-Based Buffer Overflow Vulnerability
Status
- Exploited in the wild
- In CISA KEV since 21 Jul
- Vendor fix available
Federal deadlineFri 24 Jul, 23:59 UTC
Passed 92 days ago
CISA KEV · added 21 Jul
Exploit probabilityEPSSchecked 25 Oct
4.0%probability of exploitation in the next 30 days
Higher than 90% of scored CVEs
SeverityCVSS
8.1High
Description NVD
An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 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).
CISA required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Coverage 4 articles · 2 outlets
See the full timelineShow as table
| Published (UTC) | Outlet | Headline |
|---|---|---|
| Mon 8 Jun · 07:50 UTC | Security Affairs | New Gafgyt Botnet Variant C0XMO Hijacks DDWRT Routers for DDoS |
| Wed 10 Jun · 09:10 UTC | SecurityOnline | COXMO botnet hijacks devices via CVE-2021-27137 flaw worldwide |
| Tue 21 Jul · 18:11 UTC | SecurityOnline | CISA warns of active exploits in WordPress, Langflow, DDWRT |
| Wed 22 Jul · 11:40 UTC | Security Affairs | CISA adds DDWRT, Langflow and WordPress bugs to KEV list |
- CISA adds DDWRT, Langflow and WordPress bugs to KEV listSecurity Affairs
- CISA warns of active exploits in WordPress, Langflow, DDWRTSecurityOnline · mentions it in passing
- COXMO botnet hijacks devices via CVE-2021-27137 flaw worldwideSecurityOnline
- New Gafgyt Botnet Variant C0XMO Hijacks DDWRT Routers for DDoSSecurity Affairs · first in our coverage