CVE-2025-62526: openwrt Heap Overflow — Fix

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.

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CVSS v3.1 Score

7.9

HIGH

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

Weakness Type (CWE)

CWE-122 CWE-122

Affected Products

Vendor	Product	Versions
openwrt	openwrt	< 24.10.4

References

Advisories & Patches

https://github.com/openwrt/openwrt/commit/4b907e69ea58fc0ba35fd1755dc4ba22262af3a4 https://github.com/openwrt/openwrt/commit/a7901969932a175cded3c93bdeb65f32ed3705e6 https://github.com/openwrt/openwrt/security/advisories/GHSA-cp32-65v4-cp73 https://github.com/openwrt/ubus/commit/60e04048a0e2f3e33651c19e62861b41be4c290f https://github.com/openwrt/ubus/commit/aa4a7ee1d3417bc11207ad0a78d579ece7fe0c13 https://github.com/openwrt/ubus/commit/d31effb4277bd557f5ccf16d909422718c1e49d0

Other References

https://openwrt.org/advisory/2025-10-22-1

Frequently Asked Questions

What is CVE-2025-62526? +

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. It has a CVSS v3.1 base score of 7.9 (HIGH).

How severe is CVE-2025-62526? +

CVE-2025-62526 has a CVSS v3.1 score of 7.9 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-62526? +

CVE-2025-62526 affects products from openwrt, specifically: openwrt. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-62526? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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