CVE-2021-46703

Name: CVE-2021-46703
Creator: NVD / NIST
Published: 2022-03-06T06:15:07.103+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.83%

Last modified Jun 17, 2026

CVE-2021-46703 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.83% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.83%

76.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Razorengine Project	Razorengine	< 4.5.1	—
Razorengine Project	Razorengine	4.5.1	Alpha001

References

https://github.com/Antaris/RazorEngine/issues/585Exploit, Third Party Advisory
https://github.com/Antaris/RazorEngine/issues/585Exploit, Third Party Advisory

Timeline

Published: Mar 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-46703?

How severe is CVE-2021-46703?

CVE-2021-46703 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-46703?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-46703?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST