CVE-2025-55315 | ASP.NET Security Feature Bypass Vulnerability

Exp

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.

Published: 2025-10-14 Last update: 2025-10-28 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-55315 is rated High Exploit Risk (94.3/100): CVSS Critical severity, with high exploitation likelihood (EPSS 66.26%, 99th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +64.58% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2025-55315

EDB-ID Source Kind Published Link
52492 exploit_db edb 2026-04-06 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2025-55315

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.68% 66.26% +64.58%
2 2026-05-20 1.45% 1.68% +0.23%
3 2026-05-10 — 1.45% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-55315

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.9 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.1 6.0 [email protected]

Weakness enumeration for CVE-2025-55315

GitHub Security Advisory for CVE-2025-55315

GHSA-5rrx-jjjq-q2r5 · Severity: critical · Ecosystem: nuget — Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability

OS Trackers for CVE-2025-55315

vendor priority summary link
alpine critical CVE-2025-55315: 2 source package rows (dotnet8-runtime, dotnet9-runtime); 4 state rows across 2 repos (3.22-community, edge-community); fixed 4, open 0. https://security.alpinelinux.org/vuln/CVE-2025-55315
redhat high — https://access.redhat.com/security/cve/CVE-2025-55315
ubuntu medium CVE-2025-55315 medium priority: Ubuntu including 5 source packages (dotnet10, dotnet6, dotnet7, dotnet8, dotnet9), 45 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): DNE 29, released 7, needs-triage 6, ignored 2, deferred 1. https://ubuntu.com/security/CVE-2025-55315

Affected software / configurations for CVE-2025-55315

Vendor Product Version Raw CPE
microsoft asp.net_core >= 2.3.0, < 2.3.6 cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
microsoft asp.net_core >= 8.0.0, < 8.0.21 cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
microsoft asp.net_core >= 9.0.0, < 9.0.10 cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
microsoft visual_studio_2022 >= 17.10.0, < 17.10.20 cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
microsoft visual_studio_2022 >= 17.12.10, < 17.12.13 cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
microsoft visual_studio_2022 >= 17.14.0, < 17.14.17 cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*

References for CVE-2025-55315

cvelogic Threat Intelligence