CVE-2001-0911: PHP-Nuke 5.1 stores user and administrator passwords in a base-64 encoded cookie, which could allow remote att

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HIGH 7.5DOWNGRADEDOWNGRADE

CVE-2001-0911 is a high-severity flaw (CVSS 7.5) affecting php-nuke, postnuke. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP-Nuke 5.1 stores user and administrator passwords in a base-64 encoded cookie, which could allow remote attackers to gain privileges by stealing or sniffing the cookie and decoding it.

Why this priority

High severity
EPSS top 10%: very likely to be exploited

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.9% (top 10%)
CISA exploited list	No
Published	2001-11-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: francisco burzi · postnuke software foundation

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

Am I affected?

Timeline

2001-11-21 05:00 UTCPublished CVE record published
2026-06-16 21:55 UTCUpdated Record last modified

francisco burzi php-nuke DOWNGRADE

Affected: 5.1 · 5.2 · 5.3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1

1. Check installed version

apt-cache policy php-nuke || rpm -q php-nuke || php-nuke --version

2. No fixed release: DOWNGRADE to a release before 5.1 (Debian / Ubuntu)

apt-cache madison php-nuke sudo apt install php-nuke=<VERSION_BEFORE_5.1> sudo apt-mark hold php-nuke

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

dnf --showduplicates list php-nuke sudo dnf downgrade php-nuke-<VERSION_BEFORE_5.1> sudo dnf versionlock add php-nuke

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.

postnuke software foundation postnuke DOWNGRADE

Affected: 0.64

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.64

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.64 (Debian / Ubuntu)

apt-cache madison postnuke sudo apt install postnuke=<VERSION_BEFORE_0.64> sudo apt-mark hold postnuke

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

dnf --showduplicates list postnuke sudo dnf downgrade postnuke-<VERSION_BEFORE_0.64> sudo dnf versionlock add postnuke

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-2001-0911?

php-nuke: downgrade or apply the listed mitigation; postnuke: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0911 being exploited?

CVE-2001-0911 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-2001-0911 affect?

CVE-2001-0911 affects php-nuke, postnuke. Severity is high (CVSS 7.5). PHP-Nuke 5.1 stores user and administrator passwords in a base-64 encoded cookie, which could allow remote attackers to gain privileges by stealing or sniffing the cookie and decoding it.

How urgent is CVE-2001-0911?

Priority 49/100. High severity; EPSS top 10%: very likely to be exploited

Software pages

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References

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