CVE-2013-3861

Microsoft .NET Framework 2.0 SP2, 3.5, 3.5 SP1, 3.5.1, 4, and 4.5 allows remote attackers to cause a denial of service (application crash or hang) via crafted character sequences in JSON data, aka "JSON Parsing Vulnerability."

Published: 2013-10-09 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-3861 is rated High Risk (67.2/100): CVSS High severity, with high exploitation likelihood (EPSS 78.40%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.34% 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-2013-3861

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 2026-01-11 77.06% 78.40% +1.34%
2 2025-03-30 68.20% 77.06% +8.86%
3 2025-03-29 — 68.20% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-3861

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C 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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2013-3861

Affected software / configurations for CVE-2013-3861

Vendor Product Version Raw CPE
microsoft .net_framework 2.0 cpe:2.3:a:microsoft:.net_framework:2.0:sp2:*:*:*:*:*:*
microsoft .net_framework 3.5 cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*
microsoft .net_framework 3.5 cpe:2.3:a:microsoft:.net_framework:3.5:sp1:*:*:*:*:*:*
microsoft .net_framework 3.5.1 cpe:2.3:a:microsoft:.net_framework:3.5.1:*:*:*:*:*:*:*
microsoft .net_framework 4.0 cpe:2.3:a:microsoft:.net_framework:4.0:*:*:*:*:*:*:*
microsoft .net_framework 4.5 cpe:2.3:a:microsoft:.net_framework:4.5:*:*:*:*:*:*:*

References for CVE-2013-3861

cvelogic Threat Intelligence