CVE-2015-6538: The login page in Epiphany Cardio Server 3.3, 4.0, and 4.1 mishandles authentication requests, which allows re

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2015-6538 is a critical-severity flaw (CVSS 9.8) affecting cardio server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The login page in Epiphany Cardio Server 3.3, 4.0, and 4.1 mishandles authentication requests, which allows remote attackers to conduct LDAP injection attacks, and consequently bypass intended access restrictions, via a crafted URL.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Published	2015-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ephiphanyheathdata

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

Am I affected?

Timeline

2015-12-27 19:59 UTCPublished CVE record published
2026-06-17 00:31 UTCUpdated Record last modified

ephiphanyheathdata cardio server DOWNGRADE

Affected: 3.3 · 4.0 · 4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3

1. Check installed version

apt-cache policy cardio-server || rpm -q cardio-server || cardio-server --version

2. No fixed release: DOWNGRADE to a release before 3.3 (Debian / Ubuntu)

apt-cache madison cardio-server sudo apt install cardio-server=<VERSION_BEFORE_3.3> sudo apt-mark hold cardio-server

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

dnf --showduplicates list cardio-server sudo dnf downgrade cardio-server-<VERSION_BEFORE_3.3> sudo dnf versionlock add cardio-server

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-2015-6538?

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

Is CVE-2015-6538 being exploited?

CVE-2015-6538 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-2015-6538 affect?

CVE-2015-6538 affects cardio server. Severity is critical (CVSS 9.8). The login page in Epiphany Cardio Server 3.3, 4.0, and 4.1 mishandles authentication requests, which allows remote attackers to conduct LDAP injection attacks, and consequently bypass intended access restrictions, via a crafted URL.

How urgent is CVE-2015-6538?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2015-6537 CRITICAL 9.8 DOWNGRADE SQL injection vulnerability in the login page in Epiphany Cardio Server 3.3 allows remote attackers to execute

References

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