Is CVE-2011-1271 in the CISA KEV catalog?

No. CVE-2011-1271 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-1271?

CVE-2011-1271 has a CVSS v3 base score of 7.7 (HIGH).

What is the EPSS score for CVE-2011-1271?

CVE-2011-1271 has an EPSS score of 20.10% (97th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2011-1271?

No published fix for CVE-2011-1271 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2011-1271

HIGHEPSS 97th pctl

7.7

CVSS v3

NVD

Description

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."

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

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

20.10%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

Exploit1

stackoverflow.com

Other references2

Related Vulnerabilities

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2012-1456	Medium	4.3	100%	-	-
CVE-2012-1459	Medium	4.3	100%	-	Fix
CVE-2012-1446	Medium	4.3	100%	-	-
CVE-2012-1443	Medium	4.3	100%	-	-
CVE-2012-1442	Medium	4.3	99%	-	-
CVE-2012-1457	Medium	4.3	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.