CVE-2021-27137

Publié : 16 juillet 2026

Modifié : 16 juillet 2026

Score CVSS

8.1

HIGH

Description détaillée

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).

Vecteur d'attaque (CVSS)

Vecteur brut :CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Références et Patchs

https://securityaffairs.com/193290/uncategorized/iot-botnet-c0xmo-adds-competitor-killing-capability.html https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/https://svn.dd-wrt.com/changeset/45724 https://www.bleepingcomputer.com/news/security/c0xmo-botnet-spreads-via-dd-wrt-router-flaw-kills-rival-malware/https://www.fortinet.com/blog/threat-research/inside-cross-platform-propagation-of-new-gafgyt-variant-c0xmo https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/

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