CVE-2017-20001: The AES encryption project 7.x and 8.x for Drupal does not sufficiently prevent attackers from decrypting data

This month

HIGH 7.5REMOTEUPGRADE

CVE-2017-20001 is a high-severity flaw (CVSS 7.5) affecting aes encryption. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The AES encryption project 7.x and 8.x for Drupal does not sufficiently prevent attackers from decrypting data, aka SA-CONTRIB-2017-027. NOTE: This project is not covered by Drupal's security advisory policy.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-326
Published	2021-01-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: aes encryption project

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

Am I affected?

Timeline

2021-01-01 01:15 UTCPublished CVE record published
2026-06-17 01:14 UTCUpdated Record last modified

aes encryption project aes encryption UPGRADE

Affected: >= 7.x-1.4 and <= 7.x-1.10 · >= 8.x-2.1 and <= 8.x-2.4

Fixed in: newer than 8.x-2.4

Safe to downgrade to: a release before 7.x-1.4

1. Check installed version

apt-cache policy aes-encryption || rpm -q aes-encryption || aes-encryption --version

2. UPGRADE to newer than 8.x-2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade aes-encryption

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade aes-encryption

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 7.x-1.4 (Debian / Ubuntu)

apt-cache madison aes-encryption sudo apt install aes-encryption=<VERSION_BEFORE_7.x-1.4> sudo apt-mark hold aes-encryption

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

dnf --showduplicates list aes-encryption sudo dnf downgrade aes-encryption-<VERSION_BEFORE_7.x-1.4> sudo dnf versionlock add aes-encryption

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-2017-20001?

aes encryption: upgrade to newer than 8.x-2.4. Exact commands for each OS are on this page.

Is CVE-2017-20001 being exploited?

CVE-2017-20001 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-2017-20001 affect?

CVE-2017-20001 affects aes encryption. Severity is high (CVSS 7.5). The AES encryption project 7.x and 8.x for Drupal does not sufficiently prevent attackers from decrypting data, aka SA-CONTRIB-2017-027. NOTE: This project is not covered by Drupal's security advisory policy.

How urgent is CVE-2017-20001?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Software pages

Drupal vulnerabilities

References

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