CVE-2025-62525: openwrt Input Validation Flaw — Fix

Description

OpenWrt Project is a Linux operating system targeting embedded devices. Prior to version 24.10.4, local users could read and write arbitrary kernel memory using the ioctls of the ltq-ptm driver which is used to drive the datapath of the DSL line. This only effects the lantiq target supporting xrx200, danube and amazon SoCs from Lantiq/Intel/MaxLinear with the DSL in PTM mode. The DSL driver for the VRX518 is not affected. ATM mode is also not affected. Most VDSL lines use PTM mode and most ADSL lines use ATM mode. OpenWrt is normally running as a single user system, but some services are sandboxed. This vulnerability could allow attackers to escape a ujail sandbox or other contains. 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-20 Improper Input Validation

CWE-125 Out-of-bounds Read

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
openwrt	openwrt	< 24.10.4

References

Advisories & Patches

https://github.com/openwrt/openwrt/commit/2a76abc5442e3f74d95b4caa9bb57e5488fc132e https://github.com/openwrt/openwrt/commit/e001b31163a77683ee741d169f794cfa50926f37 https://github.com/openwrt/openwrt/security/advisories/GHSA-h427-frpr-7cqr https://openwrt.org/advisory/2025-10-22-2

Frequently Asked Questions

What is CVE-2025-62525? +

OpenWrt Project is a Linux operating system targeting embedded devices. Prior to version 24.10.4, local users could read and write arbitrary kernel memory using the ioctls of the ltq-ptm driver which is used to drive the datapath of the DSL line. This only effects the lantiq target supporting xrx200, danube and amazon SoCs from Lantiq/Intel/MaxLinear with the DSL in PTM mode. The DSL driver for the VRX518 is not affected. ATM mode is also not affected. Most VDSL lines use PTM mode and most ADSL lines use ATM mode. OpenWrt is normally running as a single user system, but some services are sandboxed. This vulnerability could allow attackers to escape a ujail sandbox or other contains. 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-2025-62525? +

CVE-2025-62525 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-2025-62525? +

CVE-2025-62525 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-2025-62525? +

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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