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CVE-2013-1336

23
FAUCET Score

CVE-2013-1336 describes a critical vulnerability in the Common Language Runtime (CLR) of Microsoft .NET Framework versions 2.0 SP2 through 4.5. This flaw allows remote attackers to undetectably alter signed XML documents by bypassing signature validation, effectively spoofing digital signatures. With a CVSS score of 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N) and a FAUCET Risk Score of 97/100, it indicates a high-impact integrity vulnerability that can be exploited remotely with low complexity and no authentication. Despite its high risk, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.0CPE matchmatch criteria
cpe:2.3:a:microsoft:.net_framework:2.0:sp2:*:*:*:*:*:*
3.5CPE matchmatch criteria
cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*
3.5.1CPE matchmatch criteria
cpe:2.3:a:microsoft:.net_framework:3.5.1:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:microsoft:.net_framework:4.0:*:*:*:*:*:*:*
4.5CPE matchmatch criteria
cpe:2.3:a:microsoft:.net_framework:4.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
19.26%
Probability of exploitation in next 30 days
EPSS Percentile
97.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.1926 is in the 97th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

docs.microsoft.com / en-us/security-updates/securitybulletins/2013/ms13-040
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16559
us-cert.gov / ncas/alerts/TA13-134A
US Government Resource