CVE-2026-55490

mediumCVSS 6.5covered by 1 sourcefirst seen 2026-07-07

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.

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Exploitation outlook

Low exploitation risk0.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-55490: OpenWrt is a Linux operating system targeting embedded devices. Before v25.12.5, an integer un…nvd · 2026-07-07

External references

NVD record for CVE-2026-55490

CVE.org record

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