← Global Threat Landscape
CVE-2021-27137
CWE-121
High
89.2
RPSRPS range: 0–105; KEV-listed vulnerabilities can receive an exploitation amplifier.
Description
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).
Source: NVD
Signals
- CVSS
- 8.1
- High · v3.1
- EPSS
- 3.99%
- Probability of exploitation in the next 30 days (FIRST)
- CISA KEV
- In CISA KEV since Jul 2026
- Fix commit
- No known fix commit
- Sources: MoreFixes, FreshFixes
- Weakness
- CWE-121
- Published
- 16 Jul 2026
- Last modified 22 Jul 2026
How to read these signals: RPS · EPSS · CISA KEV · Data sources
Get this score from the API
curl -H "Authorization: Bearer dsec_live_xxxxxxxx" \
https://api.intelligence.devsecure.io/api/v1/rps/CVE-2021-27137Replace the placeholder with your key. Get a free API key or rank your own CVEs.
Data as of 7 Oct 2026, 05:16 UK time