CVE-2026-32177: microsoft microsoft .net framework 3.5 Improper Input Validation
CVSS: 7.3v3.1HighModified
AliasesUBUNTU-CVE-2026-32177
Published 12-05-2026Last modified 10-08-2026
Vulnerability summary
CVE-2026-32177 is a high (CVSS 7.3) Improper Input Validation vulnerability in microsoft microsoft .net framework 3.5. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.1% of scored vulnerabilities.
CVSS score
7.3/10
010
High · v3.1 (CVE.org)EPSS score
0.57%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 12-05-2026PublishedVulnerability first disclosed.
- 10-08-2026Last modifiedVulnerability information updated.
Description
Heap-based buffer overflow in .NET allows an unauthorized attacker to elevate privileges locally.
CVSS metrics
3 scores · 3 sources · 1 versionHigh 7.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:CSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.3HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
- NVDNIST7.3HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
+0.02 pp
From 0.55% on 20-09-2026
20-09-202620-10-2026
EPSS score0.57%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Microsoft16 products
- microsoft .net framework 3.5≥ 3.5.0, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 3.5 and 4.7.2≥ 4.7.0, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 3.5 and 4.8≥ 4.8.0, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 3.5 and 4.8.1≥ 4.8.1, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 4.6.2/4.7/4.7.1/4.7.2≥ 4.7.0, < 4.8.9334.0 and 4.8.4802.0
Ubuntu1 product
- dotnet7All versions (No fix recorded)
2 vendors · 17 products
