CVE-2012-4791

Microsoft Exchange Server 2007 SP3 and 2010 SP1 and SP2 allows remote authenticated users to cause a denial of service (Information Store service hang) by subscribing to a crafted RSS feed, aka "RSS Feed May Cause Exchange DoS Vulnerability."

Published: 2012-12-12 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-4791 is rated Moderate Risk (53.1/100): CVSS Low severity, with high exploitation likelihood (EPSS 41.87%, 97th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +8.62% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize 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-2012-4791

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 2026-05-13 33.25% 41.87% +8.62%
2 2026-02-24 36.70% 33.25% -3.45%
3 2025-12-28 — 36.70% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-4791

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2012-4791

Affected software / configurations for CVE-2012-4791

Vendor Product Version Raw CPE
microsoft exchange_server 2007 cpe:2.3:a:microsoft:exchange_server:2007:sp3:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp1:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp2:*:*:*:*:*:*

References for CVE-2012-4791

cvelogic Threat Intelligence