Microsoft .NET Framework Information Disclosure Vulnerability

.NET Framework Information Disclosure Vulnerability

CheckOps priority index

8.4/10 Patch within 24 h

Severity7.5

Probability9.9

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 98.6% higher than 99.9% of CVEs

CVSS 3.1 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 637 days 04 Feb 2025

CISA due date 25 Feb 2025 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)04 Feb 2025
Exploited in EUVD (ENISA)04 Feb 2025
Used by ransomwareno
EPSS above 10 %98.6%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Affected products

Microsoft .NET Framework 3.5 AND 4.6/4.6.2Microsoft .NET Framework 3.5 AND 4.7.2Microsoft .NET Framework 3.5Microsoft .NET Framework 2.0 Service Pack 2Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Microsoft .NET Framework 3.5.1Microsoft .NET Framework 3.0 Service Pack 2Microsoft .NET Framework 3.5 AND 4.8Microsoft .NET Framework 4.6.2Microsoft .NET Framework 3.5 AND 4.8.1Microsoft .NET Framework 4.8.NET Framework

Affected versions

10.0.0 <10.0.10240.20402
4.7.0 <4.7.04081.03
3.5.0 <3.0.50727.8976
2.0.0 <3.0.50727.8976
3.5.0 <3.0.30729.8959
3.0.0 <3.0.50727.8976
4.8.0 <4.8.04690.02
4.8.1 <4.8.09214.01

Weaknesses (CWE)

CWE-209

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

22 Mar 2024
Published
04 Feb 2025
Exploitation reported (ENISA)
04 Feb 2025
Added to the KEV catalog
25 Feb 2025
CISA remediation due date
26 Sept 2026
EPSS peak: 98.6%

References

Other exploited vulnerabilities from the same vendor

CVE-2026-96951Microsoft Windows Command Injection Vulnerability
5.6 · Actively exploited
CVE-2026-65660Microsoft SharePoint Code Injection Vulnerability
5.0 · Actively exploited
CVE-2026-85880Microsoft Windows Heap-Based Buffer Overflow Vulnerability
4.3 · Actively exploited
CVE-2026-81963Microsoft Windows Link Following Vulnerability
4.3 · Actively exploited
CVE-2019-1068Microsoft SQL Server Remote Code Execution Vulnerability
7.0 · Actively exploited
CVE-2026-69836Microsoft Entra
5.3 · Actively exploited