THREATPORT/VULNERABILITY/CVE-2009-3421
CRITICAL SEVERITY

CVE-2009-3421

Pao Bacheca Guestbook vulnerability

CVSS
9.8
EPSS
5.0%
EPSS pct
91th
Exploited
No known
login.php in Zenas PaoBacheca Guestbook 2.1, when register_globals is enabled, allows remote attackers to bypass authentication and gain administrative access by setting the login_ok parameter to 1.
Affected vendor
Zenas
Affected product
Pao Bacheca Guestbook
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-287 — Improper Authentication
Published
2009-09-25

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 5.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2009-3421

  • Confirm whether Zenas Pao Bacheca Guestbook is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2009-3421.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-3421

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-3421 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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