CVE-2026-53920 OpenWrt odhcpd - Information Disclosure

OpenWrt odhcpd 17.01.0 to < 25.12.3 contains an information disclosure vulnerability caused by improper DHCPv6 IA option parsing, letting unauthenticated network-adjacent clients leak stack memory via crafted IA options.

CVSS base score 8.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.51% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-125

Vendor fix

Update to version 25.12.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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