CVE-2026-55490

6.5 mediumEPSS 0.7%

Medium (6.5) in openwrt openwrt. EPSS 0.7% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

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

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
CWE: CWE-191
Published: 2026-07-07
Modified: 2026-07-10
Record from: the NVD, synced 2026-10-19

Affected

openwrt:openwrt

References

https://github.com/openwrt/openwrt/commit/63c0767f3d02f7b10b0f0b5293366bd059a08ca5
https://github.com/openwrt/openwrt/releases/tag/v25.12.5
https://github.com/openwrt/openwrt/security/advisories/GHSA-9558-77jp-g3fw

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