CVE-2015-3907: CodeIgniter Rest Server (aka codeigniter-restserver) 2.7.1 allows XXE attacks.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2015-3907 is a critical-severity flaw (CVSS 9.8) affecting codeigniter-restserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CodeIgniter Rest Server (aka codeigniter-restserver) 2.7.1 allows XXE attacks.

Why this priority

Critical severity
Public exploit reference
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	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-611
Published	2019-07-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: codeigniter-restserver project

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

Am I affected?

Timeline

2019-07-03 21:15 UTCPublished CVE record published
2026-06-17 00:26 UTCUpdated Record last modified

codeigniter-restserver project codeigniter-restserver DOWNGRADE

Affected: 2.7.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7.1

1. Check installed version

apt-cache policy codeigniter-restserver || rpm -q codeigniter-restserver || codeigniter-restserver --version

2. No fixed release: DOWNGRADE to a release before 2.7.1 (Debian / Ubuntu)

apt-cache madison codeigniter-restserver sudo apt install codeigniter-restserver=<VERSION_BEFORE_2.7.1> sudo apt-mark hold codeigniter-restserver

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

dnf --showduplicates list codeigniter-restserver sudo dnf downgrade codeigniter-restserver-<VERSION_BEFORE_2.7.1> sudo dnf versionlock add codeigniter-restserver

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-2015-3907?

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

Is CVE-2015-3907 being exploited?

CVE-2015-3907 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-2015-3907 affect?

CVE-2015-3907 affects codeigniter-restserver. Severity is critical (CVSS 9.8). CodeIgniter Rest Server (aka codeigniter-restserver) 2.7.1 allows XXE attacks.

How urgent is CVE-2015-3907?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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