Vulnerabilities in pkg:nuget/RazorEngine

PACKAGE

Advisory Identifier: GHSA-ph3v-2hq5-5qfq

Advisory Summary

CVE-2021-46703 is a CRITICAL (CVSS 9.8) code injection vulnerability (CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine) affecting RazorEngine libraries in the NuGet ecosystem. The issue involves code injection in razorengine. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)

Package Vulnerability Intelligence

pkg:nuget/RazorEngine

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:nuget/RazorEngine. Select an advisory below to view technical details or fixes.

Advisory ID	CVE / NVD	Severity	Summary
GHSA-ph3v-2hq5-5qfq	CVE-2021-46703	CRITICAL	Code injection in RazorEngine

CVE-2021-46703 at a Glance

CVE Identifier CVE-2021-46703

GHSA Identifier GHSA-ph3v-2hq5-5qfq

Severity CRITICAL

CVSS v3.1 Base Score 9.8

CWE Classification CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

Affected Product RazorEngine

Package Ecosystem NuGet

Published Date 2022-03-07

Last Updated 2025-03-26

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

How to Fix CVE-2021-46703

To remediate this vulnerability, upgrade all affected RazorEngine dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

RazorEngine fixed: Latest secure release

Upgrade RazorEngine to Latest secure release

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for RazorEngine

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-46703, inspect your project dependencies for RazorEngine:

inspect dependencies for RazorEngine

Analyze the terminal output to locate any version of RazorEngine in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine, where the product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. In RazorEngine, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the IsolatedRazorEngine component of Antaris RazorEngine through 4.5.1-alpha001, an attacker can execute arbitrary .NET code in a sandboxed environment (if users can externally control template contents). NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

CVE-2021-46703 Affected RazorEngine Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
RazorEngine nuget/RazorEngine	NuGet	≤ 4.5.1-alpha001

References

NVD — CVE-2021-46703 NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-46703

RazorEngine Source Repository REPOSITORY

https://github.com/Antaris/RazorEngine/issues/585

RazorEngine Source Repository REPOSITORY

https://github.com/Antaris/RazorEngine

Frequently Asked Questions

What is CVE-2021-46703?

CVE-2021-46703 is a security vulnerability in RazorEngine involving Code injection in RazorEngine under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine.

Which RazorEngine versions are affected?

Affected versions include releases prior to current release patches across affected packages: RazorEngine.

What version fixes CVE-2021-46703?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is RazorEngine affected?

Yes, RazorEngine is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2021-46703?

CVE-2021-46703 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2021-46703?

CVE-2021-46703 is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine (The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.).

How can I check NuGet dependencies for CVE-2021-46703?

Run the dependency tree command: 'inspect dependencies for RazorEngine'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ph3v-2hq5-5qfq",
  "modified" : "2025-03-26T15:32:24Z",
  "published" : "2022-03-07T00:00:41Z",
  "aliases" : [ "CVE-2021-46703" ],
  "summary" : "Code injection in RazorEngine",
  "details" : "In the IsolatedRazorEngine component of Antaris RazorEngine through 4.5.1-alpha001, an attacker can execute arbitrary .NET code in a sandboxed environment (if users can externally control template contents). NOTE: This vulnerability only affects products that are no longer supported by the maintainer.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "RazorEngine"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "4.5.1-alpha001"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-46703"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Antaris/RazorEngine/issues/585"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Antaris/RazorEngine"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1336" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-03-11T20:30:20Z",
    "nvd_published_at" : "2022-03-06T06:15:00Z"
  }
}

CVSS V3

9.8 CRITICAL