What is CVE-2021-27137?

CVE-2021-27137 is a high-severity vulnerability in Dd-wrt, classified under Stack-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-07-16.

How severe is CVE-2021-27137?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in Dd-wrt

CVE-2021-27137

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. Exploit…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Dd-wrt — versions 0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2021-27137?: CVE-2021-27137 is a high-severity vulnerability in Dd-wrt, classified under Stack-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-07-16.
How severe is CVE-2021-27137?: High severity. CVSS v3 base score is 8.1 out of 10.