CVE-2003-0317: iisPROTECT 2.1 and 2.2 allows remote attackers to bypass authentication via an HTTP request containing URL-enc

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HIGH 7.5DOWNGRADE

CVE-2003-0317 is a high-severity flaw (CVSS 7.5) affecting iisprotect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

iisPROTECT 2.1 and 2.2 allows remote attackers to bypass authentication via an HTTP request containing URL-encoded characters.

Why this priority

High severity
EPSS top 7%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	6.0% (top 7%)
CISA exploited list	No
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: iisprotect

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2003-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:01 UTCUpdated Record last modified

iisprotect iisprotect DOWNGRADE

Affected: 2.1 · 2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison iisprotect sudo apt install iisprotect=<VERSION_BEFORE_2.1> sudo apt-mark hold iisprotect

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

dnf --showduplicates list iisprotect sudo dnf downgrade iisprotect-<VERSION_BEFORE_2.1> sudo dnf versionlock add iisprotect

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.

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: IISProtect 2.1/2.2 - Authentication Bypass

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-2003-0317?

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

Is CVE-2003-0317 being exploited?

CVE-2003-0317 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-2003-0317 affect?

CVE-2003-0317 affects iisprotect. Severity is high (CVSS 7.5). iisPROTECT 2.1 and 2.2 allows remote attackers to bypass authentication via an HTTP request containing URL-encoded characters.

How urgent is CVE-2003-0317?

Priority 55/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2003-0377 HIGH 7.5 UPGRADE SQL injection vulnerability in the web-based administration interface for iisPROTECT 2.2-r4, and possibly earl

References

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