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Vulnerability record · CVE-2025-62526 · published 22 October 2025

CVE-2025-62526: Openwrt heap-based buffer overflow vulnerability

Openwrt · Openwrt

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.

7.8 CVSS 3.1 High EPSS 0.26% · top 84.4% CWE-122 · Heap-based buffer overflow
7.8CVSS 3.1 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/openwrt/openwrt/commit/4b907e69ea58fc0ba35fd1755dc4ba22262af3a4 Patch
https://github.com/openwrt/openwrt/commit/a7901969932a175cded3c93bdeb65f32ed3705e6 Patch
https://github.com/openwrt/openwrt/security/advisories/GHSA-cp32-65v4-cp73 PatchVendor Advisory
https://github.com/openwrt/ubus/commit/60e04048a0e2f3e33651c19e62861b41be4c290f Patch
https://github.com/openwrt/ubus/commit/aa4a7ee1d3417bc11207ad0a78d579ece7fe0c13 Patch
https://github.com/openwrt/ubus/commit/d31effb4277bd557f5ccf16d909422718c1e49d0 Patch
https://openwrt.org/advisory/2025-10-22-1 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-62526), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.