CVE-2026-48715
High
Description
radvd is a router advertisement daemon for IPv6. Prior to version 2.21, the `radvdump` utility shipped with radvd contains a stack buffer overflow in the Route Information option parser. When processing a crafted ICMPv6 Router Advertisement, `print_ff()` copies up to 2032 bytes from attacker-controlled packet data into a 16-byte `struct in6_addr` on the stack, overflowing by up to 2016 bytes. Note that the main `radvd` daemon is not affected by the vulnerability. Version 2.21 patches the issue.
SeverityHigh
CVSS8.8
Exploit probability—
ProductRadvd
PublishedJun 19, 2026
First seenJun 19, 2026
Weakness typeCWE-121CWE-121
How to fix
Update
- radvd.litech radvd2.21 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| radvd.litech radvd | v < 2.21 | 2.21 |
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