Buffer overflow in Microsoft .Net Framework 3.5
CVE-2026-70354
Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (27.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Microsoft .Net Framework 3.5 — versions 3.5.0
- Microsoft .Net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2 — versions 3.0.0.0
- Microsoft .Net Framework 3.5 And 4.7.2 — versions 4.7.0
- Microsoft .Net Framework 3.5 And 4.8 — versions 4.8.0
- Microsoft .Net Framework 3.5 And 4.8.1 — versions 4.8.1
- Microsoft .Net Framework 4.6.2/4.7/4.7.1/4.7.2 — versions 4.7.0
- Microsoft .Net Framework 4.8 — versions 4.8.0
- Microsoft .Net Framework 4.8.1 — versions 4.8.0.0
- Microsoft Visual Studio 2022 Version 17.14 — versions 17.14.0
- Microsoft Visual Studio 2026 Version 18.8 — versions 18.0
Weakness classification (CWE)
References
- .NET Core Remote Code Execution Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-70354?
- CVE-2026-70354 is a high-severity vulnerability in Microsoft .Net Framework 3.5, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-08-11.
- How severe is CVE-2026-70354?
- High severity. CVSS v3 base score is 7.8 out of 10.