Description
lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| lwIP | TCP/IP Stack MQTT | 2.0.1 – ≤ 2.2.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | lwip | 2.2.1+dfsg1-8 | — |
| Debian 13 | lwip | No fix yet | — |
| Debian 12 | lwip | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | lwip | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | lwip | No fix yet | — |
| Ubuntu Pro 24.04 LTS | lwip | No fix yet | — |
| Ubuntu Pro 22.04 LTS | lwip | No fix yet | — |
| Ubuntu Pro 20.04 LTS | lwip | No fix yet | — |
Advisories 1
- ICSA-26-265-01 lwIP TCP/IP Stack MQTT Client Application CISA ICS & IT advisories · Sep 22, 2026