CVE-2025-62526
HighCVSS 7.9Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
Prior to version 24.10.4, ubusd in OpenWrt contains a heap buffer overflow in the event registration parsing code. This allows an attacker to modify the head and potentially execute arbitrary code in the context of the ubus daemon; the affected code runs before ACL checks, so all ubus clients can send such messages. The crafted subscription also bypasses the listen ACL. This is fixed in OpenWrt 24.10.4.
Risk Assessment
Any ubus client can send a crafted event registration message, potentially causing heap corruption, arbitrary code execution in the context of ubusd, and bypass of the listen ACL. This may compromise the integrity and security of the OpenWrt device.
Recommendation
Update OpenWrt to version 24.10.4 or later. No workarounds exist, so updating is required.
Other vulnerabilities in OpenWrt
See all- CVE-2026-62947Medium
OpenWrt prior to version 25.12.5 has a vulnerability in the cgi-download handler in cgi-io that allows reading root-readable files including /etc/shadow via path traversal using an allowed wildcard prefix followed by ../.
- CVE-2026-55490Medium
In OpenWrt before v25.12.5, an integer underflow in the handle_send_a() function of the Emergency Access Daemon allows any unauthenticated attacker on the local network to crash the daemon by sending a single crafted UDP packet. The issue is fixed in v25.12.5.
- CVE-2025-62525High
In OpenWrt prior to 24.10.4, local users could read and write arbitrary kernel memory using ioctls of the ltq-ptm driver (affects lantiq target with xrx200, danube, and amazon SoCs in PTM mode). This could allow escaping a ujail sandbox or other containers; no workarounds exist.
Original NVD description (English source)
OpenWrt Project is a Linux operating system targeting embedded devices. Prior to version 24.10.4, ubusd contains a heap buffer overflow in the event registration parsing code. This allows an attacker to modify the head and potentially execute arbitrary code in the context of the ubus daemon. The affected code is executed before running the ACL checks, all ubus clients are able to send such messages. In addition to the heap corruption, the crafted subscription also results in a bypass of the listen ACL. This is fixed in OpenWrt 24.10.4. There are no workarounds.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS