Back to overview

CVE-2026-55490

MEDIUM
6.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-55490
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 22:28 UTC
Published
2026-07-07 21:08 UTC
Last updated
2026-07-07 21:08 UTC
Primary CWE
CWE-191
CWE-191: Integer Underflow (Wrap or Wraparound)
Vendor / Product
openwrt / openwrt
Sources
cve.org  ·  NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products (1)
VendorProductPlatformVersions
openwrt openwrt — < 25.12.5
Weakness (CWE)
CWESourceDescription
CWE-191 cna CWE-191: Integer Underflow (Wrap or Wraparound)
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.5 MEDIUM 3.1 cna CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References (3)
Back to overview