Description
In FreeBSD 12.2-STABLE before r365730, 11.4-STABLE before r365738, 12.1-RELEASE before p10, 11.4-RELEASE before p4, and 11.3-RELEASE before p14, a programming error in the ure(4) device driver caused some Realtek USB Ethernet interfaces to incorrectly report packets with more than 2048 bytes in a single USB transfer as having a length of only 2048 bytes. An adversary can exploit this to cause the driver to misinterpret part of the payload of a large packet as a separate packet, and thereby inject packets across security boundaries such as VLANs.
References (1)
Core 1
Core References
Vendor Advisory x_refsource_misc
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:27.ure.asc
Scores
CVSS v3
5.3
EPSS
0.0028
EPSS Percentile
51.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Details
CWE
CWE-74
Status
published
Products (4)
freebsd/freebsd
11.3 (14 CPE variants)
freebsd/freebsd
11.4 (4 CPE variants)
freebsd/freebsd
12.1 (10 CPE variants)
freebsd/freebsd
12.2
Published
Mar 26, 2021
Tracked Since
Feb 18, 2026