CVE-2015-7855 · cross-distro fix matrix

CVE-2015-7855: The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.

Affects 1 Linux release across 1 (distro × package) combinations.

Elevated exploitation risk

FIRST EPSS puts CVE-2015-7855's probability of exploitation in the next 30 days at 31% (98th percentile of all CVEs)— well above the noise floor. Prioritize it.

EPSS:31% · 30-day exploit probability98th percentile

Fix per ecosystem

Each block below is a distro release where CVE-2015-7855 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

ntp→ fixed in1:4.2.8p4+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y ntp
```

Are YOU affected by CVE-2015-7855?

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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