CVE-2017-1000053: Elixir Plug before v1.0.4, v1.1.7, v1.2.3 and v1.3.2 is vulnerable to arbitrary code execution in the deserial

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HIGH 8.1REMOTEUPGRADE

CVE-2017-1000053 is a high-severity flaw (CVSS 8.1) affecting plug. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Elixir Plug before v1.0.4, v1.1.7, v1.2.3 and v1.3.2 is vulnerable to arbitrary code execution in the deserialization functions of Plug.Session.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-502
Published	2017-07-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: plug project

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

Am I affected?

Timeline

2017-07-17 13:18 UTCPublished CVE record published
2026-06-17 00:58 UTCUpdated Record last modified

plug project plug UPGRADE

Affected: >= 1.0.0 and < 1.0.4 · >= 1.1.0 and < 1.1.7 · >= 1.2.0 and < 1.2.3 · >= 1.3.0 and < 1.3.2

Fixed in: 1.0.4, 1.1.7, 1.2.3, 1.3.2

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy plug || rpm -q plug || plug --version

2. UPGRADE to 1.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade plug

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade plug

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison plug sudo apt install plug=<VERSION_BEFORE_1.0.0> sudo apt-mark hold plug

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list plug sudo dnf downgrade plug-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add plug

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2017-1000053?

plug: upgrade to 1.0.4, 1.1.7, 1.2.3, 1.3.2. Exact commands for each OS are on this page.

Is CVE-2017-1000053 being exploited?

CVE-2017-1000053 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-2017-1000053 affect?

CVE-2017-1000053 affects plug. Severity is high (CVSS 8.1). Elixir Plug before v1.0.4, v1.1.7, v1.2.3 and v1.3.2 is vulnerable to arbitrary code execution in the deserialization functions of Plug.Session.

How urgent is CVE-2017-1000053?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-1000883 MEDIUM 6.5 UPGRADE Elixir Plug Plug version All contains a Header Injection vulnerability in Connection that can result in Given
CVE-2017-1000052 HIGH 7.8 UPGRADE Elixir Plug before v1.0.4, v1.1.7, v1.2.3 and v1.3.2 is vulnerable to null byte injection in the Plug.Static c

References

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