CVE-2019-5420 · cross-distro fix matrix

CVE-2019-5420: A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically generated development mode secret token. This secret token can be used in combination with other Rails internals to escalate to a remote code execution exploit.

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

Elevated exploitation risk

FIRST EPSS puts CVE-2019-5420's probability of exploitation in the next 30 days at 92% (100th percentile of all CVEs)— well above the noise floor. Prioritize it.

EPSS:92% · 30-day exploit probability100th percentile

Fix per ecosystem

Each block below is a distro release where CVE-2019-5420 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

rails→ fixed in2:5.2.2.1+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y rails
```

Debian bookworm

Source: Debian Security Tracker

rails→ fixed in2:5.2.2.1+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y rails
```

Debian trixie

Source: Debian Security Tracker

rails→ fixed in2:5.2.2.1+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y rails
```

Are YOU affected by CVE-2019-5420?

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

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