CVE-2009-1733: Cross-site request forgery (CSRF) vulnerability in IPplan 4.91a allows remote attackers to hijack the authenti

Routine

MEDIUM 6.8DOWNGRADE

CVE-2009-1733 is a medium-severity flaw (CVSS 6.8) affecting ipplan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site request forgery (CSRF) vulnerability in IPplan 4.91a allows remote attackers to hijack the authentication of administrators for requests that (1) change the password, (2) add users, or (3) delete users via unknown vectors.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-352
Published	2009-05-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: richard ellerbrock

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

Am I affected?

Timeline

2009-05-20 19:30 UTCPublished CVE record published
2026-06-16 23:07 UTCUpdated Record last modified

richard ellerbrock ipplan DOWNGRADE

Affected: 4.91a

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.91a

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.91a (Debian / Ubuntu)

apt-cache madison ipplan sudo apt install ipplan=<VERSION_BEFORE_4.91a> sudo apt-mark hold ipplan

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

dnf --showduplicates list ipplan sudo dnf downgrade ipplan-<VERSION_BEFORE_4.91a> sudo dnf versionlock add ipplan

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-2009-1733?

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

Is CVE-2009-1733 being exploited?

CVE-2009-1733 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-2009-1733 affect?

CVE-2009-1733 affects ipplan. Severity is medium (CVSS 6.8). Cross-site request forgery (CSRF) vulnerability in IPplan 4.91a allows remote attackers to hijack the authentication of administrators for requests that (1) change the password, (2) add users, or (3) delete users via unknown vectors.

How urgent is CVE-2009-1733?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2021-42943 MEDIUM 5.4 DOWNGRADE Stored cross-site scripting (XSS) in admin/usermanager.php over IPPlan v4.92b allows remote attackers to injec
CVE-2009-1732 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in admin/usermanager in IPplan 4.91a allows remote attackers to injec

References

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