CVE-2015-3203: Unrestricted file upload vulnerability in h5ai before 0.25.0 allows remote attackers to execute arbitrary code

Q: How do I fix CVE-2015-3203?

h5ai: upgrade to newer than 0.24.1. Exact commands for each OS are on this page.

Q: Is CVE-2015-3203 being exploited?

CVE-2015-3203 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-3203 affect?

CVE-2015-3203 affects h5ai. Severity is high (CVSS 7.5). Unrestricted file upload vulnerability in h5ai before 0.25.0 allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in the directory specified b

Q: How urgent is CVE-2015-3203?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

This week

HIGH 7.5UPGRADE

CVE-2015-3203 is a high-severity flaw (CVSS 7.5) affecting h5ai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unrestricted file upload vulnerability in h5ai before 0.25.0 allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in the directory specified by the href parameter.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	9.4% (top 5%)
CISA exploited list	No
Published	2015-09-28
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: h5ai project

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

Am I affected?

Timeline

2015-09-28 16:59 UTCPublished CVE record published
2026-06-17 00:25 UTCUpdated Record last modified

h5ai project h5ai UPGRADE

Affected: <= 0.24.1

Fixed in: newer than 0.24.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy h5ai || rpm -q h5ai || h5ai --version

2. UPGRADE to newer than 0.24.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade h5ai

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade h5ai

Note

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: h5ai < 0.25.0 - Unrestricted Arbitrary File Upload

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-2015-3203?

h5ai: upgrade to newer than 0.24.1. Exact commands for each OS are on this page.

Is CVE-2015-3203 being exploited?

CVE-2015-3203 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-2015-3203 affect?

CVE-2015-3203 affects h5ai. Severity is high (CVSS 7.5). Unrestricted file upload vulnerability in h5ai before 0.25.0 allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in the directory specified b

How urgent is CVE-2015-3203?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

References

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