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.
Metrics
Affected Vendors & Products
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| Openwrt |
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References
History
Tue, 07 Jul 2026 23:15:00 +0000
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Openwrt
Openwrt openwrt |
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Openwrt
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Tue, 07 Jul 2026 21:45:00 +0000
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| 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. | |
| Title | OpenWrt: EAD Integer Underflow → Pre-Auth Denial of Service | |
| Weaknesses | CWE-191 | |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-07T21:08:26.638Z
Reserved: 2026-06-16T22:28:27.062Z
Link: CVE-2026-55490
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-07-07T23:00:04Z