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CVE-2021-27137

Quick assessment

Affected
DD-WRT DD-WRT
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DD-WRT是DD-WRT组织开源的一种基于 Linux 的替代开源固件。适用于各种 WLAN 路由器和嵌入式系统。 DD-WRT 45724之前版本存在缓冲区错误漏洞，该漏洞源于UPnP处理功能中使用了不安全的strcpy函数，可能导致未经身份验证的远程攻击者发送请求使内部固定缓冲区溢出。

CVSS 8.1 · High KEV EPSS 4.00% · P90

Affected Version Matrix 1

VendorProduct Version RangeStatus
DD-WRT DD-WRT < 45724 affected
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I. Basic Information for CVE-2021-27137

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
DD-WRT 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DD-WRT是DD-WRT组织开源的一种基于 Linux 的替代开源固件。适用于各种 WLAN 路由器和嵌入式系统。 DD-WRT 45724之前版本存在缓冲区错误漏洞，该漏洞源于UPnP处理功能中使用了不安全的strcpy函数，可能导致未经身份验证的远程攻击者发送请求使内部固定缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
DD-WRT DD-WRT 0 ~ 45724 -

II. Public POCs for CVE-2021-27137

# POC Description Source Link Shenlong Link
1 None https://github.com/Threekiii/Awesome-POC/blob/master/%E7%BD%91%E7%BB%9C%E8%AE%BE%E5%A4%87%E6%BC%8F%E6%B4%9E/DD-WRT%20UPNP%E7%BC%93%E5%86%B2%E5%8C%BA%E6%BA%A2%E5%87%BA%E6%BC%8F%E6%B4%9E%20CVE-2021-27137.md POC Details
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III. Intelligence Information for CVE-2021-27137

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Patches & Fixes for CVE-2021-27137 (1)

Vendor Advisories for CVE-2021-27137 (1)

News Coverage for CVE-2021-27137 (2)

IV. Related Vulnerabilities

Same product: DD-WRT
Same vendor: DD-WRT
Same weakness: CWE-121

V. Comments for CVE-2021-27137

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