CVE-2026-62947
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk28th percentile - higher than 28% of all known CVEs
Summary
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 ../.
Risk Assessment
An unauthorized attacker can read sensitive system files, leading to leakage of passwords and other confidential data.
Recommendation
Upgrade OpenWrt to version 25.12.5 or later, which includes the fix for this vulnerability.
Other vulnerabilities in OpenWrt
See all- 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-2025-62526High
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.
- 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 is a Linux operating system targeting embedded devices. Prior to 25.12.5, the cgi-download handler in cgi-io authorizes the requested path against the caller's ubus session file ACL before canonicalization, and rpcd session.c uses fnmatch() without FNM_PATHNAME, allowing traversal such as an allowed wildcard prefix followed by ../ to read root-readable files including /etc/shadow. This vulnerability is fixed in 25.12.5.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS