CVE-2010-1256

Unspecified vulnerability in Microsoft IIS 6.0, 7.0, and 7.5, when Extended Protection for Authentication is enabled, allows remote authenticated users to execute arbitrary code via unknown vectors related to "token checking" that trigger memory corruption, aka "IIS Authentication Memory Corruption Vulnerability."

Published: 2010-06-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2010-1256 is rated Moderate Risk (63.2/100): CVSS High severity, with high exploitation likelihood (EPSS 28.21%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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-2010-1256

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 2026-06-15 33.55% 28.21% -5.34%
2 2026-03-04 51.75% 33.55% -18.20%
3 2026-03-01 — 51.75% —

Full EPSS history (39 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2010-1256

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.5 2.0 HIGH
AV:N/AC:M/Au:S/C:C/I:C/A:C 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:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 6.8 10.0 [email protected]

Weakness enumeration for CVE-2010-1256

NVD evaluator notes for CVE-2010-1256

Comment: Per: http://www.microsoft.com/technet/security/bulletin/ms10-040.mspx 'Mitigating Factors for IIS Authentication Memory Corruption Vulnerability - CVE-2010-1256 Without the installation of KB973917 on Windows Server 2003, Windows Vista, and Windows Server 2008, systems will not have the Extended Protection for Authentication feature and will not be vulnerable. Extended Protection for Authentication is not enabled by default on any affected platform, even when a system has installed KB973917. Systems are only affected when this feature is enabled.'

Affected software / configurations for CVE-2010-1256

Vendor Product Version Raw CPE
microsoft internet_information_server 6.0 cpe:2.3:a:microsoft:internet_information_server:6.0:*:*:*:*:*:*:*

References for CVE-2010-1256

cvelogic Threat Intelligence