VULNERABILITY INTELLIGENCE

CVE-2026-55490

CVSS score6.5 MEDIUM
EPSS probability0.68%
CISA KEVNot currently listed
Published2026-07-07
Last modified2026-07-10
CVSS vectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

OpenWrt is a Linux operating system targeting embedded devices. Before v25.12.5, an integer underflow in handle_send_a() of the Emergency Access Daemon allows any unauthenticated attacker on the local network to crash the daemon by sending a single crafted UDP packet. The message length underflows before a bounds check and is then passed to memcpy as a very large size. This issue is fixed v25.12.5.

Weakness classification

  • security-advisories@github.com: CWE-191

Primary references