CVE-2015-5501: The Hostmaster (Aegir) module 6.x-2.x before 6.x-2.4 and 7.x-3.x before 7.x-3.0-beta2 for Drupal allows remote

This month

HIGH 7.5DOWNGRADE

CVE-2015-5501 is a high-severity flaw (CVSS 7.5) affecting hostmaster. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Hostmaster (Aegir) module 6.x-2.x before 6.x-2.4 and 7.x-3.x before 7.x-3.0-beta2 for Drupal allows remote attackers to execute arbitrary PHP code via a crafted file in the directory used to write Apache vhost files for hosted sites in a multi-site environment.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-254
Published	2015-08-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: aegirproject

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

Am I affected?

Timeline

2015-08-18 18:00 UTCPublished CVE record published
2026-06-17 00:29 UTCUpdated Record last modified

aegirproject hostmaster DOWNGRADE

Affected: 6.x-2.0 · 6.x-2.1 · 6.x-2.2 · 6.x-2.3 · 6.x-3.0 beta1

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.x-2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.x-2.0 (Debian / Ubuntu)

apt-cache madison hostmaster sudo apt install hostmaster=<VERSION_BEFORE_6.x-2.0> sudo apt-mark hold hostmaster

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hostmaster sudo dnf downgrade hostmaster-<VERSION_BEFORE_6.x-2.0> sudo dnf versionlock add hostmaster

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-2015-5501?

hostmaster: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-5501 being exploited?

CVE-2015-5501 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-2015-5501 affect?

CVE-2015-5501 affects hostmaster. Severity is high (CVSS 7.5). The Hostmaster (Aegir) module 6.x-2.x before 6.x-2.4 and 7.x-3.x before 7.x-3.0-beta2 for Drupal allows remote attackers to execute arbitrary PHP code via a crafted file in the directory used to write Apache vhost files for hosted sites in

How urgent is CVE-2015-5501?

Priority 47/100. High severity

Software pages

Drupal vulnerabilities · PHP vulnerabilities

References

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