Secuno
ENNL
Book demo

CVE-2025-55315

Microsoft Asp.net Core vulnerability

9.9 CRITICALEPSS 65.9%
  1. Published14 Oct 2025

Description

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Affected products

Microsoft Asp.net Core≥ 2.3.0 < 2.3.6 · ≥ 8.0.0 < 8.0.21 · ≥ 9.0.0 < 9.0.10
Microsoft Visual Studio 2022≥ 17.10.0 < 17.10.20 · ≥ 17.12.10 < 17.12.13 · ≥ 17.14.0 < 17.14.17

Remediation

Fixed in
Microsoft Asp.net Core≥ 2.3.6
Microsoft Visual Studio 2022≥ 17.10.20

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-8877310.0
Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')…
CVE-2026-863509.1
Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling')…
CVE-2026-935698.2
A flaw was found in Netty. A remote unauthenticated attacker can exploit a…
CVE-2026-922389.8
A maliciously constructed mail header could lead to multiple fields being parsed as…
CVE-2026-692178.7
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s…
CVE-2026-692058.7
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s…

Frequently asked

Is CVE-2025-55315 being actively exploited?

CVE-2025-55315 is not in the CISA KEV catalog. Its EPSS exploit probability is 65.9%.

How severe is CVE-2025-55315?

CVE-2025-55315 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 65.9% probability of exploitation.

Which products are affected by CVE-2025-55315?

Affected products include Microsoft Asp.net Core, Microsoft Visual Studio 2022.

How do I fix CVE-2025-55315?

Upgrade affected software to a fixed version, for example Microsoft Asp.net Core 2.3.6, Microsoft Visual Studio 2022 17.10.20 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-55315 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.