CVE-2012-3523 · cross-distro fix matrix

CVE-2012-3523: The STARTTLS implementation in nnrpd in INN before 2.5.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" at

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

Fix per ecosystem

Each block below is a distro release where CVE-2012-3523 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

inn2→ fixed in2.5.3-1urgency: low

sudo apt-get install --only-upgrade -y inn2

Debian bookworm

Source: Debian Security Tracker

inn2→ fixed in2.5.3-1urgency: low

sudo apt-get install --only-upgrade -y inn2

Debian trixie

Source: Debian Security Tracker

inn2→ fixed in2.5.3-1urgency: low

sudo apt-get install --only-upgrade -y inn2

Are YOU affected by CVE-2012-3523?

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.

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