CVE-2006-0866: PunBB 1.2.10 and earlier allows remote attackers to conduct brute force guessing attacks for an account's pass

Routine

MEDIUM 5.0DOWNGRADE

CVE-2006-0866 is a medium-severity flaw (CVSS 5.0) affecting punbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PunBB 1.2.10 and earlier allows remote attackers to conduct brute force guessing attacks for an account's password, which may be as short as 4 characters.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2006-02-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: punbb

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

Am I affected?

Timeline

2006-02-23 23:02 UTCPublished CVE record published
2026-06-16 22:21 UTCUpdated Record last modified

punbb punbb DOWNGRADE

Affected: 1.0 · 1.0.1 · 1.0_alpha · 1.0_beta1 · 1.0_beta1a · 1.0_beta2 · 1.0_beta3 · 1.0_rc1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison punbb sudo apt install punbb=<VERSION_BEFORE_1.0> sudo apt-mark hold punbb

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

dnf --showduplicates list punbb sudo dnf downgrade punbb-<VERSION_BEFORE_1.0> sudo dnf versionlock add punbb

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-2006-0866?

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

Is CVE-2006-0866 being exploited?

CVE-2006-0866 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-2006-0866 affect?

CVE-2006-0866 affects punbb. Severity is medium (CVSS 5.0). PunBB 1.2.10 and earlier allows remote attackers to conduct brute force guessing attacks for an account's password, which may be as short as 4 characters.

How urgent is CVE-2006-0866?

Priority 35/100. No elevated risk signals yet.

Related CVEs

CVE-2021-28968 MEDIUM 5.4 UPGRADE An issue was discovered in PunBB before 1.4.6
CVE-2011-3371 MEDIUM 4.3 UPGRADE Multiple cross-site scripting (XSS) vulnerabilities in include/functions.php in PunBB before 1.3.6 allow remot
CVE-2010-0455 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in forum/viewtopic.php in PunBB 1.3 allows remote attackers to inject
CVE-2009-4894 MEDIUM 4.3 UPGRADE Multiple cross-site scripting (XSS) vulnerabilities in profile.php in PunBB before 1.3.4 allow remote attacker
CVE-2008-7241 MEDIUM 6.8 UPGRADE Cross-site request forgery (CSRF) vulnerability in PunBB before 1.2.17 allows remote attackers to hijack the a

References

← Back to latest CVEs