CVE-2011-1901

The mail-filter web interface in Proofpoint Messaging Security Gateway 6.2.0.263:6.2.0.237 and earlier in Proofpoint Protection Server 5.5.3, 5.5.4, 5.5.5, 6.0.2, 6.1.1, and 6.2.0 allows remote attackers to bypass authentication via unspecified vectors.

Published: 2011-05-05 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-1901 is rated Moderate Risk (57.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.98%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-1901

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-19 0.73% 0.98% +0.26%
2 2025-12-15 0.98% 0.73% -0.26%
3 2025-09-13 — 0.98% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-1901

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2011-1901

Affected software / configurations for CVE-2011-1901

Vendor Product Version Raw CPE
proofpoint messaging_security_gateway <= 6.2.0.263\:6.2.0.237 cpe:2.3:a:proofpoint:messaging_security_gateway:*:*:*:*:*:*:*:*
proofpoint protection_server 5.5.3 cpe:2.3:a:proofpoint:protection_server:5.5.3:*:*:*:*:*:*:*
proofpoint protection_server 5.5.4 cpe:2.3:a:proofpoint:protection_server:5.5.4:*:*:*:*:*:*:*
proofpoint protection_server 5.5.5 cpe:2.3:a:proofpoint:protection_server:5.5.5:*:*:*:*:*:*:*
proofpoint protection_server 6.0.2 cpe:2.3:a:proofpoint:protection_server:6.0.2:*:*:*:*:*:*:*
proofpoint protection_server 6.1.1 cpe:2.3:a:proofpoint:protection_server:6.1.1:*:*:*:*:*:*:*
proofpoint protection_server 6.2.0 cpe:2.3:a:proofpoint:protection_server:6.2.0:*:*:*:*:*:*:*

References for CVE-2011-1901

cvelogic Threat Intelligence