How severe is CVE-2011-4851?

CVE-2011-4851 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-4851 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4851?

CVE-2011-4851 affects Parallels Parallels Plesk Panel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-4851?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-4851 published?

CVE-2011-4851 was published on 2011-12-16 and last updated on 2026-06-16.

CVE-2011-4851

CVE-2011-4851 is a critical-severity vulnerability in Parallels Parallels Plesk Panel with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-255.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-255
Affected product: Parallels Parallels Plesk Panel
Published: 2011-12-16
Last modified: 2026-06-16

Description

The Control Panel in Parallels Plesk Panel 10.4.4_build20111103.18 generates a password form field without disabling the autocomplete feature, which makes it easier for remote attackers to bypass authentication by leveraging an unattended workstation, as demonstrated by forms in server/google-tools/ and certain other files.

Frequently asked questions

What is CVE-2011-4851?: The Control Panel in Parallels Plesk Panel 10.4.4_build20111103.18 generates a password form field without disabling the autocomplete feature, which makes it easier for remote attackers to bypass authentication by leveraging an unattended workstation, as demonstrated by forms in server/google-tools/ and certain other files.
How severe is CVE-2011-4851?: CVE-2011-4851 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-4851 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4851?: CVE-2011-4851 affects Parallels Parallels Plesk Panel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-4851?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-4851 published?: CVE-2011-4851 was published on 2011-12-16 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:parallels:parallels_plesk_panel:10.4.4_build20111103.18:*:*:*:*:*:*:*

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