CVE-2009-2408 · cross-distro fix matrix

CVE-2009-2408: Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to

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

Fix per ecosystem

Each block below is a distro release where CVE-2009-2408 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

nss→ fixed in3.12.3-1urgency: medium

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

Debian bookworm

Source: Debian Security Tracker

nss→ fixed in3.12.3-1urgency: medium

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

Debian trixie

Source: Debian Security Tracker

nss→ fixed in3.12.3-1urgency: medium

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

Are YOU affected by CVE-2009-2408?

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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