OpenWrt ubusd vulnerable to heap buffer overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-62526
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-22 15:16:07 UTC
Updated2026-10-19 16:10:00 UTC
DescriptionOpenWrt 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.002570000 probability, percentile 0.162830000 (date 2026-10-19)

Problem Types: CWE-122 | CWE-122 CWE-122: Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary7.9HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
3.1CNADECLARED7.9HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Openwrt Openwrt All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Openwrt Openwrt affected < 24.10.4 Not specified

References

ReferenceSourceLinkTags
openwrt.org/advisory/2025-10-22-1 [email protected] openwrt.org Third Party Advisory
github.com/openwrt/openwrt/commit/a7901969932a175cded3c93bdeb65f32ed3705e6 [email protected] github.com Patch
github.com/openwrt/openwrt/commit/4b907e69ea58fc0ba35fd1755dc4ba22262af3a4 [email protected] github.com Patch
github.com/openwrt/openwrt/security/advisories/GHSA-cp32-65v4-cp73 [email protected] github.com Patch, Vendor Advisory
github.com/openwrt/ubus/commit/aa4a7ee1d3417bc11207ad0a78d579ece7fe0c13 [email protected] github.com Patch
github.com/openwrt/ubus/commit/d31effb4277bd557f5ccf16d909422718c1e49d0 [email protected] github.com Patch
github.com/openwrt/ubus/commit/60e04048a0e2f3e33651c19e62861b41be4c290f [email protected] github.com Patch
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