CVE-2020-7704: The package linux-cmdline before 1.0.1 are vulnerable to Prototype Pollution via the constructor.

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2020-7704 is a critical-severity flaw (CVSS 9.8) affecting linux-cmdline. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package linux-cmdline before 1.0.1 are vulnerable to Prototype Pollution via the constructor.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-1321
Published	2020-08-17
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: linux-cmdline project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-08-17 17:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

linux-cmdline project linux-cmdline UPGRADE

Affected: < 1.0.1

Fixed in: 1.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy linux-cmdline || rpm -q linux-cmdline || linux-cmdline --version

2. UPGRADE to 1.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade linux-cmdline

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade linux-cmdline

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

npm · linux-cmdline · FIXED · 1.0.1 · vulnerable: < 1.0.1 · source

npm install linux-cmdline@">=1.0.1" npm ls linux-cmdline

Fedora ELN · python-discovery · FIXED · 1.9.0-1.eln159 · FEDORA-2026-7a881c0c99 · source

sudo dnf upgrade --advisory=FEDORA-2026-7a881c0c99

Fedora 46 · pipx · FIXED · 1.18.11-1.fc46 · FEDORA-2026-443a765287 · source

sudo dnf upgrade --advisory=FEDORA-2026-443a765287

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: snyk.io/vuln/SNYK-JS-LINUXCMDLINE-598674
GitHub PoC: Live-Hack-CVE/CVE-2020-7704

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7704?

linux-cmdline: upgrade to 1.0.1. Exact commands for each OS are on this page.

Is CVE-2020-7704 being exploited?

CVE-2020-7704 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7704 affect?

CVE-2020-7704 affects linux-cmdline. Severity is critical (CVSS 9.8). The package linux-cmdline before 1.0.1 are vulnerable to Prototype Pollution via the constructor.

How urgent is CVE-2020-7704?

Priority 71/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

References

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