CVE-2026-53921 odhcpd - Buffer Overflow

odhcpd prior to version 25.12 contains a stack buffer overflow caused by improper handling of DHCPv6 IA response in the DHCPv6 IA response handler, letting remote attackers execute code via crafted UDP packets, exploit requires network access.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.88% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-121

Vendor fix

Update to version 25.12 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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