Description
OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, odhcpd writes a DHCPv6 client FQDN option 39 hostname into /tmp/odhcpd.leases through src/statefiles.c statefiles_write_state6() and statefiles_write_state4() without escaping, allowing newline injection of forged lease lines that LuCI rpcd-mod-luci getDHCPLeases displays through htdocs/luci-static/resources/view/status/include/40_dhcp.js and htdocs/luci-static/resources/luci.js dom.append as live HTML in the Active DHCPv6 Leases admin page. This vulnerability is fixed in 25.12.5.
Severity (CVSS)
| Base score | 9.6 |
|---|---|
| Severity | Critical |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| Provided by | CNA |
Weaknesses
- CWE-79 — CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CWE-117 — CWE-117: Improper Output Neutralization for Logs
- CWE-150 — CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences
Affected products
| Vendor | Product | Versions |
|---|---|---|
| openwrt | openwrt | < 25.12.5 |
References
- https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f (x_refsource_CONFIRM)
- https://github.com/openwrt/odhcpd/pull/404 (x_refsource_MISC)
- https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a (x_refsource_MISC)
- https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a (x_refsource_MISC)
- https://github.com/openwrt/openwrt/releases/tag/v25.12.5 (x_refsource_MISC)
Generated from the official CVE List on 16 Jul 2026 07:01 UTC.