CVE-2021-40085 · cross-distro fix matrix

CVE-2021-40085: An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-40085 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

neutron→ fixed in2:17.2.1-0+deb11u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y neutron
```

Debian bookworm

Source: Debian Security Tracker

neutron→ fixed in2:18.1.0-3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y neutron
```

Debian trixie

Source: Debian Security Tracker

neutron→ fixed in2:18.1.0-3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y neutron
```

Are YOU affected by CVE-2021-40085?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

CVE-2021-40085dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

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