CVE-2011-1271

.Net Framework vulnerability

CVSS

7.7

EPSS

20.1%

EPSS pct

97th

Exploited

No known

The JIT compiler in Microsoft .NET Framework 3.5 Gold and SP1, 3.5.1, and 4.0, when IsJITOptimizerDisabled is false, does not properly handle expressions related to null strings, which allows context-dependent attackers to bypass intended access restrictions, and consequently execute arbitrary code, in opportunistic circumstances by leveraging a crafted application, as demonstrated by (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, or (3) a crafted .NET Framework application, aka ".NET Framework JIT Optimization Vulnerability."

Affected vendor

Microsoft

Affected product

.Net Framework

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Weakness type (CWE)

CWE-264 — Permissions, Privileges, and Access Controls
CWE-476 — NULL Pointer Dereference

Published

2011-05-10

Risk analysis

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

Its EPSS score of 20.1% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2011-1271

Confirm whether Microsoft .Net Framework is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2011-1271.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-1271

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