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CVE-2026-30872— OpenWrt Project has a Stack-based Buffer Overflow vulnerability via IPv6 reverse DNS lookup

Quick assessment

Affected
openwrt openwrt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenWrt是OpenWrt开源的一套针对嵌入式设备的Linux操作系统。 OpenWrt 24.10.6之前版本和25.12.1之前版本存在安全漏洞，该漏洞源于mdns守护进程的match_ipv6_addresses函数存在栈缓冲区溢出，可能导致远程代码执行。

AI Predicted 8.8 Difficulty: Easy EPSS 1.09% · P64

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-30872

Vulnerability Information
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Vulnerability Title
OpenWrt Project has a Stack-based Buffer Overflow vulnerability via IPv6 reverse DNS lookup
Source: CVE Program / CVE List V5
Vulnerability Description
OpenWrt Project is a Linux operating system targeting embedded devices. In versions prior to 24.10.6 and 25.12.1, the mdns daemon has a Stack-based Buffer Overflow vulnerability in the match_ipv6_addresses function, triggered when processing PTR queries for IPv6 reverse DNS domains (.ip6.arpa) received via multicast DNS on UDP port 5353. During processing, the domain name from name_buffer is copied via strcpy into a fixed 256-byte stack buffer, and then the reverse IPv6 request is extracted into a buffer of only 46 bytes (INET6_ADDRSTRLEN). Because the length of the data is never validated before this extraction, an attacker can supply input larger than 46 bytes, causing an out-of-bounds write. This allows a specially crafted DNS query to overflow the stack buffer in match_ipv6_addresses, potentially enabling remote code execution. This issue has been fixed in versions 24.10.6 and 25.12.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
OpenWrt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenWrt是OpenWrt开源的一套针对嵌入式设备的Linux操作系统。 OpenWrt 24.10.6之前版本和25.12.1之前版本存在安全漏洞，该漏洞源于mdns守护进程的match_ipv6_addresses函数存在栈缓冲区溢出，可能导致远程代码执行。
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
openwrt openwrt >= 25.12.0-rc1, < 25.12.1 -

II. Public POCs for CVE-2026-30872

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III. Intelligence Information for CVE-2026-30872

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Vendor Advisories for CVE-2026-30872 (1)

Vendor Pages for CVE-2026-30872 (2)

Same Patch Batch · openwrt · 2026-03-19 · 5 CVEs total

CVE-2026-32721 8.6 HIGH LuCI luci-mod-network: Possible XSS attack in WiFi scan on Joining Wireless Client modal
CVE-2026-30871 OpenWrt Project has Stack-based Buffer Overflow in DNS PTR Query
CVE-2026-30873 OpenWrt Project jsonpath: Memory leak when processing strings, labels, and regexp tokens
CVE-2026-30874 OpenWrt procd PATH Environment Variable Filter Bypass via Incorrect String Comparison Lead

IV. Related Vulnerabilities

Same product: openwrt
Same vendor: openwrt
Same weakness: CWE-121

V. Comments for CVE-2026-30872

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